I think some people don't realize just how much of the pack comes from RP2. There is no way you can replace it and keep using your existing world, which is unacceptable. I think a lot of us are about to hit a Tekkit-like update wall. I just restarted my server when Ultimate came out, I'm not going to do it again for awhile, I'm tired of starting over for now.
The only solution I see is that the mod could be dissected and then distributed to other mods if their authors are willing to take on the extra work (and Eloraam would/could allow her mod to be taken apart). Other that that, what is the solution? Sure, there are other mods that could cover some of the things RP brings to the game, but getting multiple mods to play nice and then make some attempt to balance them to fit with everything else would be a nightmare, and would take weeks or months to get ready (at which time another vanilla update would come out and wreck the whole thing). I really have no idea what's going on with Eloraam, I don't follow the apparent drama that has been ongoing for as long I remember, but it seems like if you are going to commit to a larger project like this, then you need to either keep your end up or just stop altogether and pass the burden on to someone else.
The real solution to this problem would be if Mojang would quit screwing around and get the Mod API out there, but, alas, that is a debate for another thread.