Ole's reign in terms of trophies I feel won't be a success but it could have a massive effect going forward if it pays off and set the club up nicely.
Obviously no guarantee's that success will come back to us but OGS has got rid of alot of the deadwood at the expense of having squad depth/giving the kids a chance. Our future looks bright with the likes of Maguire, AWB, Henderson, McTominay, Gomes, Garner, Chong, James, Greenwood, Martial and Rashford. If 3-4 of them can develop into top class players then we have a good chance, and you can see that happening easily enough for Maguire, AWB, and Martial. Rashford will be in and around the team, we will see how he develops in the next few years. Greenwood is all the hype at the minute, but expectations need to be tempered. He's still very young and showed nothing yet in a professional sense. James has made a great start but there are still question marks over him. At worst, I think he will be squad cover and at best, will be one of the leading PL wingers. Henderson, Gomes, Garner and Chong, no one can really say with any certainty, all have talent and hopefully 1-2 can make it into the first team and become good players.
No managers would ditch a 15 + goals striker in the position United are in without signing a replacement. That's what OGS has done with Lukaku. He's now challenged Martial, Rashford and Greenwood to take up the mantle of being United's main striker. The majority of managers would think of the short term here and keep Lukaku in the team even if it may be detrimental in the long term.
Seems to have adopted a buy young hungry players policy and moved away from the temptation of throwing money at marquee players. A lot of managers have fallen into this trap and it has failed miserably at United.
He's kept Pogba at the club for now and De Gea. Unsure about De Gea, but Pogba definitely has a good relationship with OGS and would have been gone if Mourinho was still in charge.