Well, than I would want better weather. Droughts, rainbows, floods, and plants being affected by those things. Maybe also some more expansion to the nether, like new ores and dungeons, maybe some dead trees too
Right. I don't know why so many people think that 2.0 is what comes after 1.9. This isn't math class so version numbers don't need to be base 10.
I seriously doubt there will ever be a Minecraft 2.0, but if there is, it would probably be re-written in platform independent C++ so it could be run on PC, Mac, Linux, Xbox, Playstation, etc. Imagine a world where you could play Minecraft on your PC and play with people across the world on Xbox on the same server.