VR stands the chance of being a win/win.

If it succeeds and people like it, than even more games will be made for VR and it'll likely evolve in cool and interesting ways.

If it's a gimmick that flops, that $400 will quickly drop to a clearanced $150 and the people who are excited about it right now (but don't want to pay the price of a new console) will at least have a lighter load on the wallet to experience the games already coming out for it.