My dream show would be a cartoon following the adventures of Luke, Han, and the gang between SW and ESB. Rebels on the run, space pirates, smugglers, new villains, new love interests, crazy adventures, new monsters etc.
Because any sequal has to take the "And they lived happily ever after..." from the end of ROTJ and add a big "BUT!" to it.
If they did, I'd like to see it be based primarily on smaller adventure stories about
a: Cleaning up the now increasingly pleasent galaxy from small time tyrants, crime lords, and misc. baddies. It will take time for the great New Republic to really straighten out the Galaxy.
b: Searching for new Potential Jedi and lost Jedi Knowledge to rebuild the Order. This would be Luke's life's work. The Order shouldn't be totally rebuilt in 10 or 20 years.