Well if you remember others have been both Captain America and Thor before. Bucky Barnes was Captain America after Steve Rogers was shot. Also Beta Ray Bill ( Hope that was right sorry ) and I heard also Jane Foster was Thor for a time. They like to mix things up once in a while. I think it gives a good twist to it. But back to Starwars it will be ok. They have Leeland Chee , Dave Falloni , Pablo Hidalgo who are really big Starwars Fans and have more knowlege of Starwars than most people have ever thought of. Also all of them are big fans of the EU. So I see a bunch of EU being put into the new cannon. Also the old Eu is not gone it has just been set as Legends. Which is ok because our stories will always be there. Am I sad to see the old Eu go? Yeah, but I am also excited to see what new things that they can come up with for Starwars. Just look who they have to help write Starwars Episode 7 Lawrence Kasdan. He was the the one who made Empire Strikes back the best Starwars movie. So I am not worried. I just hope there are no Lense Flares
The good thing is one of the writers for Rebels and the novels coming out recently said that the old stuff is canon until contradicted and even then those stories contradictaded are still kind canon just not the details of the events =]