I do not think anything he does from now to the end of the season will have impact on value for him.
If he has a good 3 months, his value is not suddenly going to go to £200m.
So we should play Pogba and forget our rebuild? Lets play games of football knowing Pogba wont be there? That is a dumb move.
You want to play with players you know are committed to the club.
That's naive to say the least. It's a Euros summer. He needs to prove his fitness and show some form in order to first get selected for France and then to start games for them. If he does well in the Euros his value could rocket, like it did after the WC. But he needs to have a couple of good months of club football under his belt to precipitate all that.
If he doesn't play again, he might not even get picked by Deschamps. Or more likely he might be a squad option instead of a starter, due to lack of form.