Here's my take on property rights of online leagues:
It's the decision of the owner. I would not allow just anyone, if I ever would entertain, a move away from running eMLB. There was technically two co-Founders, but only one Commissioner in the end who's run the league for the entire 9 years it's been running.
I don't see anyone being able to run this particular universe to the levels I would expect of it. With property rights comes to intellectual rights, and I personally don't believe my league will be run any better by someone else, so I doubt I'd ever permit someone to continue it if I ever get to a point I no longer would.
Bottom line: You can pry the password of eMLB from my cold, dead brain tissue.