Instead of a full "takeover", another possibility is to start a "Community Edition" with a transaparently managed repository. There the needed fix could be applied first, without ruling out the possibility of a return of the old main developer.
This sounds like a good idea to me.
Yes, a good idea indeed, but Qora dev left so long ago now that chances are he isn't coming back, so whoever starts 'doing things' will probably get community support very quickly, it's not like the problem here is rival dev camps squabbling over what to do, the problem is if people are really doing things behind the scenes, it's not obvious to the community what those things are, and if they're getting results.
Crypto is so full of false dawns and pumps, and the true believers still following qora are battled hardened to BS now.
Whover steps up and takes the controls can drive qora as far as I'm concerned, they just need to show what they're doing, not just promises. Show a github, drop an updated client etc
If crow is the guy cool, if not then new blood by any means.