Pugs, while quite brilliant implementation, supports and depends on parrot
I don't think that pugs depends on parrot in any way. Sure, if you want to use PGE (which is written in PIR), then you need a working parrot somewhere. But that's just a small part of what you get from pugs.
Besides, now that there's a prototype implementation of PGE, who's to say that someone won't recreate it using Parsec? (In fact, I believe Audrey has already started doing this) Just because some small part of pugs uses parrot doesn't mean that that part can't be swapped out with a non-parrot version at any time.
The real question is: Will we get a workable perl6 compiler out of all this? :-)