For one, V-Mart had an .861 OPS last season, even at first base, that's valuable, add to that the ability to catch even if on a limited basis, and i have no idea how you can say he "loses his value" if moved to first, that's one of the dumbest things i have ever, ever heard, and i don't mean to insult you but Jesus Christ.
Second, you use the term "young catcher of the future" pretty loosely. There really aren't that many options *Cough* Joe Mauer *Cough*.