There's always the potential of RP in 1.6, but needless to say there's no plan on it so far. Myself, I've been making my recent builds and base without RP .. so, CC based systems, buildcraft red/blue pipe wire and structure pipes, etc. It's an interesting process unto itself, and if a server has a month to "de-RP" themselves, this sort of issue can be tackled. Of course, if someone's used RP microblocks to hold up a lava block .. yeah .. that could quickly turn ugly. Plus, there's no real (any?) replacement for RP frames.
And this is why, backups are awesome