> for example imagine playing a Magic the Gathering (or similar) card game, and watching your cards come to life on the board in hologram-esque 3D

This is the kind of thing that buries VR ideas. It's very cute in a demo, but as an actual product, the cost of coming up with 3D models and animations for all MTG cards currently being played is many orders of magnitude more than the total number of people who would pay for this. Ultimately this is completely unnecessary fluff for the game, like chess games where the pieces actually fight: irrelevant, and it actually detracts from the game because it interrupts the flow of what you're actually doing.