Should it ever be possible on mobile?
This might be a ridiculous thing to say, but I don't think any real 'hardcore' gaming happens on mobile. I admittedly do not game as much as I used to, but I could never stomach giving up the pixels that came with a computer setup or console games...
I'm a big fan of Megaman, and those games are fine to play on a smaller screen, but for most of the games that people are trying to play on mobile, you have to settle for lower graphics, slower gameplay, and just a degraded experience overall.
Eseentially - I would rather play Metal Gear Solid on a TV/large Computer screen with a computationally adequate machine rather than try and play it from a 4" screen