And the problem is that ROTJ ended the saga too definitively. It's the same reason all attempts at doing any new series in the Babylon 5 universe all failed, because the main series wrapped up everything to such and extent new things couldn't exist.

Hell, in Dr Who, I've lost count at how many times the Dr has regenerated, but they somehow manage to find new ways to keep it going. Probably a little creativity. So, you know, never say never.
Anyhow, this is the last I'm saying on it. We're not getting anywhere.