Realistically he'll contribute with 2 assists at the most and United will struggle to establish good play down that left side due to Shaw being completely reserved going forward. He doesn't want to commit himself because he is too unfit to keep running all game, so it'll effect his technique if he does so. It looks like he is more focused on preserving his energy than contribute. He takes forever on the ball and struggles to make a quick decision, which contributes heavily to making our whole play too safe, as you often need your fullback to move even if it is just to open up room for the midfield.
We don't even have a real competitor for him if he continues his tendencies. It is just not offensively he struggles to make use of his abilities, he has become a lot more soft in his defending. He used to put pressure on wingers pretty quickly when they moved around in his area, but these days he can't close them down quick enough and we concede a lot of needless chances because of this. Still good 1vs1 and in duels.
I think we should just get rid of him at this moment. His stock is not at its lowest right now but I assume his wages are big so if he doesn't improve this season we'd be stuck with him as his value would drop. Today I think we could have replaced him with someone like Chilwell, without losing much money if at all.