If the route is the same as last year, parks should be clear by park opening except Epcot. I ran through between 9:15-9:30 and there were thousands behind me. The crowds were roped off and allowed to cross in waves. You may have a very short delay.
Traffic to AK, EP, and DHS could be impacted early Sunday morning. Disney manages it well though.
I would make no changes based on Star Wars marathon weekend other than it may take a few extra minutes to get to a park on Sunday morning.