Mentioned this in the Georges-Kevin thread but I think what we're seeing with Poch is he is very willing to give young players a chance to perform. They will get more minutes here than anywhere else, but will be held to the standards of more experienced players and coasting will not be allowed. Some, like Kane, Dier, and Alli will step up and deserve it. Others, like N'Jie, Townsend and potentially Son, may be on the way out no matter how harsh it looks. Poch sees this guys train every day and may think they are good guys and decent players, but if they can't perform at the top level, he's going to let them go to try with guys who can. Players like Dier have proved that it is possible, it's about mentality as much as anything.
We haven't really got time to wait to see if players will perform in 3 years. We want to be challenging the top clubs by buying smarter. We will give young players more opportunity to make a name for themselves than anywhere else, but they will need to earn that spot they are being trusted with. If not, they will be out. The alternative is the Wenger approach, with too much trust shown in players with average mentalities, who only perform when the pressure is off. That's not what we need.