Just an additional thought about this:
I don't really know anything about the cost of running a site like this so forgive me if this is totally out of touch.
IIRC, I think you had mentioned @ENTERPRISE that the cost per month is something like $300. Are there ways to bring that cost down significantly? Maybe there are features the site doesn't really need until/unless the user base were larger that could be dropped?
Could there be a situation where the site is stripped down as much as is reasonably possible without destroying the core functionality to reduce the cost, and thus give you more time/flexibility in finding a new owner? Or if the per month cost were significantly less, you could potentially let someone here take over the management and monthly cost sort of indefinitely while you remain the owner for as long as it takes to sell the site, or figure out a way to transition it without shutting it down?
If the monthly cost were much less, I could potentially even afford to essentially keep the lights on while you/we figure out what to do next.
What is to stop you/us from building a server ourselves and just hosting the site on that? Wouldn't really need that much bandwidth for something like this, right? Heck, I could setup a server and host the site from my standard comcast home plan without any issues I'd think. Then all we would need is someone who knows how to move the site over to that server, which I don't know anything about but I'd imagine a lot of people here do.
So is there any reason someone here couldn't setup a server and host the site from there?