I have no doubt that this campaign will slow down. Nor do I doubt that people will do RP's focused on the new conquests. That part, quite frankly, is your job, and everyone else's. Mine, at the moment, is to include as many Apprentices as I can, keep an eye on them, knock off the rough corners -- and that means giving them things they can be excited about. If my Apprentices and I do, say, two more Dominions after Gand, that should give me enough time to polish them up a little. So far I'm seeing a good learning curve with willingness to edit and other hallmarks of progress.
That's my priority. Considering we're talking about a self-contained map area with relatively modest gains, and considering the Republic just took a huge swath of very planet-dense space, I doubt we'll have much of a public relations problem.