You know how there's 88 keys on the piano? What if the keys were divided by 1/4th steps rather than half steps? So that would be 176 keys! Wouldn't that be kool? It would open up so many possibilities for composing!
I don't know, that's just a thought.
Just imagine: how are you going to teach a beginner? As it is now, you can start with a C scale and don't even have to explain anything theoretically. You will also have to relearn the whole existing repertoire, fingering, etc.
P.S.: Actually, attempts to "improve" upon the existing 88-keys keyboard have been made. There is, for example, the Paul Jankó keyboard (1882) with 264 keys, but it didn't become popular, mainly because of the reasons I mentioned. If this is ever to happen, it will probably only benefit the composers and maybe the listeners, but certainly not the performers. Although... I read somewhere that composers would rather get rid of the performer anyway to remove certain limits in physical execution, so it could all be "for the best"...
Paul