Agree. Think Shaw should spend some time in the U21s for the rest of this season and look towards next season. It's been a difficult first season for him and it all goes back to a bad pre-season for him. I'm all for young players going to the U21s tournament this summer and getting tournament experience but might be best if Shaw missed out given his fitness problems this season and then he can get a full pre season in.
As for Blind, not sure he will replace Carrick in midfield but he'll certainly be a very good player to have in the squad.