Yeah, if the writers/artists end up going to Marvel anyway, then it's a win-win (for Disney, at least) for them to make future Star Wars comics "in-house" at Marvel. They'd be using the same talent so (in theory) the quality should stay the same, and they wouldn't have to worry about licensing out the franchise to a competitor.
Although depending on how much Dark Horse pays for the Star Wars license, it might make more financial sense for them to let DH keep paying them to license it, I dunno.