I think we all agree with Larry's position: no guarantees of stability:
"Until 6.0.0, there is *no* guarantee of stability. You are all Early Adopters. If you can't figure out how to snapshot a particular version and keep it around, you probably shouldn't be Early Adopting. The whole point of Rakudo * is to give us lots of Early Adopters so we can put lots of final polish onto 6.0.0 as rapidly as possible after that. Don't start asking us to leap across the chasm before
~~ Larry Wall, March 2010.
That said, stability (contrasted with a guarantee of stability) is still a significant issue for most Early Adopters. So it makes sense to me that the Perl 6 and Rakudo teams are considering how they might best accommodate those who care about stability; and that Patrick was considering writing a document to formalize stability policy (even if that policy starts with "there are no guarantees of stability!"); and that Patrick was asking for input from users and other interested parties about these issues.