I'm considering trying to design a new campaign world for my game, as the current world I've been working on hasn't turned out to be that interesting. So my question is, how much stuff do you change when making up a campaign world?
More specificially, as both a player and a DM, what do you think of redoing the core races (dropping some, adding others, switching around abilities and so forth), maybe changing the available core classes, futzing with the combat system, and/or redoing the magic system? How much stuff has to stay the same for it to still be considered D&D? How much stuff would you want to stay constant if you were to play in this campaign? Basically, how much house-ruling goes on before it's a different game entirely? And then would you still want to play it?
Also, would people here actually care my ideas for these changes and want to discuss them sometime in the future?