What if THE FLOOR WAS LAVA!!!
Then Utsuho would be very, very happy. Everyone else, considerably less so, especially Cirno and Letty. Reimu would set out to figure out whodunnit and probably beat up a few youkai before getting tired and falling in the lava. Utsuho'd probably be the only survivor so Touhou 14 would be about her and... uh... ...hrm. Well, Touhou 14 would probably be a very boring game. People would get kind of upset over that and ZUN may receive a few angry letters demanding their money back for a game with nothing but Okuu flying over lava. Naturally some people would consider it a pretty darn innovative idea, because some people will support just about anything. We may end up seeing the emergence of a new sub-genre of games where "nothing happens" as a result.
In conclusion, this would be a very boring idea. Let's not flood Gensokyo with lava; indie gaming can only suffer from it. :/
...That or Yukari would be like, "LOL GODMODE BITCHES!" and manipulate the boundary between hot and cold to make everything okay again.
What if Touhou were more like Tetris?
![Cheesy :D](/forum/Smileys/default/cheesy.gif)