While python/ruby are arguable better languages in a lot of ways, they're also completely different and lacking in a lot of what PHP offers.

Everyone has their own languages of preference, and personally I really dislike working with python (not too much experience in ruby) while dealing with websites. I cringe each time I'm forced to check the manual for random function behavior, but its not enough to make me move over.

What I'm really looking for is an improved version of PHP. One that keeps most of its style but removing the backwards-compatible crap. It looks like HipHop may go down that path in the near future (they've already added python-style yield generator functions)