I know the whole point of Minecraft is to look that way, plus with texture packs, you can play MC in high end graphics. But, will they ever make a new Minecraft? I don't think they would need to considering that they can keep updating the current Minecraft. And I think that's their plan going into the future.
I don't see why they would ever make a new Minecraft when they can just as easily modify the current build to be better with each new update. I don't see a purpose, because what would a sequel to MC even be? I just don't see it being feasible.