I got another idea for the plot of a JK3 game, since toms brought up the idea of "going back in time" since the Remnant vs. Allliance thing has totally played out (Kyle can't keep losing and regaining his powers, Remnant has been crushed so many times, etc.)
How about playing as Rahn
? Remember that guy from the first JK? He fought in the Clone Wars and survived the purge... he went into hiding as he ran from Vader, and later Jerec, as he seeked out the location of the Valley of the Jedi over the years. Then he meets Morgan Katarn (Kyle's dad) and learns the location. He eventually confronts Jerec and, well, we all know how that turns out.