Err, at the very least, on en.wiki, he's the sole
member of the
"founder" class.
That's just a courtesy title, as far as I know, there are no rights
associated with that user group.
Perhaps his only remaining 'de jure'
authority is to appoint or
de-appoint ArbCom members.
"de jure" under what law and enforced how?
As for open rebellion - not without the
foundation's support.
Can't just occupy the servers. ;)
We wouldn't need the foundations support, we would just need them not
to object (and if they do, there's always the option to fork, but
things would have to get seriously bad for us to even consider that).
Jimbo has no direct power over the servers (he has a single vote in
board meetings, that's it).
You could always run a strawpoll.
I have no desire to oust Jimbo, so I'm not going to start any polls on
the matter. If anyone else does want to oust him, they are, of course,
welcome to try.