If PearPC becomes really popular, and very reliable, than we can only hope for two things other than total stopping of development.
1. Apple will buy the whole project (is that possible?) and turn it into something like VirtualPC for Mac (nope. not possible).
2. Apple will keep it's hardware at the same relative price, but will instead raise the price of their stand-alone OS to something like $300. (is this a good thing?)
Well, knowing the internet, PearPC will probably never truly die, if only to live through more questionable sources, like P2P. All we can hope is that Apple has a good plan. I think that if they come out with a stable version of Mac emulation on a Windows, long before PearPC does, most (or atleast many) of us will switch to that. But you just got to love that homebrewn open-source feel.
BTW, the iMac G5 has come out and it looks not only awesome, but not very