Should already established full internationals be playing at the U-21 Tourney in June?

Shouldn't the U-21's be used more for players on the way up rather than Wilshere who is becoming established at full-level?. Andy Carroll is also said to be going plus two (three if you count Gibbs) who have played at full level. I know Wilshere wants to play but he will probably be resting when Arsenal begin pre-season training. This could lead to him feeling he is behind other Arsenal players in fitness and over-stretching himself to catch up. Is an U21 tourney really worth messing with the fitness of potential full internationals just a year before the Euro's?