Despite having somehow ended-up with this tagline, I like Bruno.... but if a really good offer comes in, it's a no-brainer for me.
A sale would represent pure profit, I believe, since his fee is long since paid? Also, we can learn from how other clubs have diddled us down the years...selling a player who hits 30/31 before their form plummets.
I actually think Bruno will have a good career, he's never been quick and his fitness / injury-record is great...but at some point, that will change!
I think, the chances are there for Bruno to last quite long. He is weiry and all, if he cares for himself, he can manage to play for quite some time. The thing is though, the comparison to Giggs and Modric fall short because they were surrounded by great teams. Obviously such teams can manage to balance out a player that starts to get a little slower and weaker. The thing with United is, we aren't a good team these days, with or without Bruno. If we keep him or not - we still need goal scorers, we still need to add players who help with chance creation (good chances), players who help controlling the midfield or at least not falling early victims in midfield battles. We need additions anyway and a big influx in money, when well invested, would greatly help with that.
To me, it is obvious, that, speaking in FIFA terms, two 84 players suited to a (your) system is better than one 89 player. But I can see why others come to different conclusions I guess.
(on a side note, regarding your tag line, congrats to the new position, honestly feel a little left out

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To go into next season without Bruno would be leaving Amorim with a weaker squad than he's currently got, unless we have an incredible transfer window. The argument that we would be able to afford an incredible window with the sale of Bruno may be correct on one level, but can we really attract the players we would need to not only replace Bruno but significantly improve the squad too? Because that's what needed, and if we fail to win Europa we will have no European football to offer new players on the back of our worst season since we were relegated.
The idea isn't to replace a player like for like. I mean, we have the original Bruno right now and we still find ourselves in a position where we need to add players for scoring goals, generating high quality chances, not getting steamrolled in midfield, controlling the ball in midfield. With or without him, the need to do serious work is already there even though, obviously the weighting of priorities changes a bit if he would leave.
To me the biggest difference between us and the teams we fight for places these days isn't the quality of players - it is physicality, intensity, workrate and tactical organisation. Talent wise we might not be where we want to be comparing our players to "theirs" but it isn't as if we are lightyears away from them. If we could "exchange" Bruno, a player that delivers something on 9 out of 10 games, for 2 to 3 players that deliver something in 6-8 out of 10 games, we'd improve significantly as a team.
Another season like this, or god-forbid worse, would immediately nullify any profit we make from this deal, and we're much more likely to have a season like that with Bruno gone.
It wouldn't nullify that at all. It could if we'd bring in the wrong players, I agree with that, but if we add a player (or more) on a slightly younger side or from a different league there is obviously a chance that some bed-in time will be needed.
I assure you that selling Eric was considered a big hit at the time especially when we replaced him with a player who was considered as a quick fix and who was clearly a downgrade. However I do agree that we had a much better squad at the time. That's a non brainer.
My point is that there are certain players that while being incredibly good they do tend to attract all the attention and the focus on themselves. Thus the team start playing to suit them which of course makes sense considering that they are the best players but do tend to hurt the squad's ability to be unpredictable and to step up to the next level. I can mention a lot of players, all of whom legends of the game, who were like that from Eric to Ibra right to Baggio. They all dominated the squads they played for, dictating their tempo and would struggle when they failed to do so. I do wonder if Bruno is like that as well. Let us not forget that Sporting started dominating the league the year after Bruno left. Not that I am expecting that to happen with United.
To conclude I think that there's no real correct answer to this question. Bruno staying make sense as he's our best player, he's a leader and we're indeed a poor side. Bruno leaving for silly money make sense as well as we need the money to rebuild the side, he might be attracted to that silly money as well, he's nearly 31 and we're probably not going to win the league in his 'career time'. I fully subscribe to what Howson said a day or two ago. I am glad that I am not the one taking that decision.
I completely agree, I think, the question really is what are you valueing more - the very next season or the next season
s. And some are placing too much weight on the current state of the team, where admittedly, it seems as if Bruno is more or less 80 to 85% of all things chance creation. But even if it were 100% it would still not result in a sufficient level for a team with our ambitions so we have to do stuff there anyways.