If you care about small perl6 apps, which do not have to scale with concurrent CPUs, yes. But parrot has a much bigger scale. And lock-free threads.
And JIT?
The parrot jit will need some time.
First the runloop changes for method calls and argument autoboxing needs to be reverted, then the jit will be revived.
But on the other side I just fixed the GC bug, so it looks good now even on parrot.