Twitch plays minecraft? That would be a sight to see. 2d games, easy enough, 3d game, might be a tad more difficult to set up than getting a fusion reactor on gregtech within the first 24 hours
How about Dwarf Fortress.
TPP works because of the interface. The Pokemon games operate based on single button presses, while Minecraft works based on a lot of press-and-hold mechanics, or mechanics that are not so simple to be typed in. The hard part of Twitch Plays Minecraft wouldn't actually be playing Minecraft, it would be figuring out how Twitch chat COULD play Minecraft, how the text commands would interface with the game's controls.
Well many modders are smart, I'm sure it would be possible to turn mouse controlled commands into relatively simple text commands, for example:
using the cardinal directions of N(orth),S(outh),E(ast),W(est),U(p),D(own) And action buttons: B(reak),P(place),R(ightclick)
moving your perspective would be done with any three letter combination of the six cardinals so 'NE' or 'SU', or 'WSD' or 'ENE' (75% east, 25% north)
Crafting would be tricky sure, but you could use numbers for slots both in inventory and crafting grid:
C1 C2 C3
C4 C5 C6 T(ake)
C7 C8 C9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36
1 2 3 4 5 6 7 8 9
so, say you have a stick in slot 3 and coal in slot 10, you want to craft a torch say:
'1c4' or '1>c4' or '1-C4' whatever is easier then
then you've crafted a torch and placed it in your inventory in three steps (for moving stuff inside inventory we probably need to use the X>Y form)
anyway that's just what I came up with after thinking about it for five minutes, I'm pretty sure a real modder could do much better!