I'm not saying Elo is a shining example of modding's best practices, or that we can't complain about it. There's really two situations:
- Option 1: Try and remove RP2. This means most people will have to restart, those that don't will have to make significant changes to their world or just not update. The primary means of mining for a lot of people will be gone, and the tubes you used to use for machines will also be gone. Until another mod replaces redpower 2, you're left with still good but not quite as much so buildcraft pipes (remember, no logistics pipes yet). A lot of people will simply not update. Additionally, this creates a ton more work for the pack creators who now have to run around finding replacement mods in the hopes of rebuilding what they can of RP2's functionality, or on mod makers to try and add features. Chances are an RP2 update will come out anyway after this process is done.
- Option 2: Just wait and see, because it's still too early to tell. You can always go through the above process later if it becomes clear that RP2 updates are such a significant problem, and you can update some smaller packs without it if such a strong demand for instant updates is there. Some impatient people will complain, but everyone gets to keep their save, or if RP2 is ultimately replaced, can keep using FTB confident that the modpack will only be changed if absolutely necessary, so restarting / remaking will be a one-time ordeal.
Of course the best of all worlds is that Elo either releases an update sooner than expected, or finally announces that she has in fact retired and passes on the mod to a new person who is more communicative, updates more frequently, open-sources the mod, and adds an API.