I believed them from the get go and don't doubt their sincerity now. Rush as a recording and touring act, are done. Perhaps things change a few years from now but I wouldn't lay bets. It was a great run and a long one, there really wasn't anything held back. We got it all and I eagerly await some archival releases. Currently I'm converting all those Rush shows from shns into flac so I'm occupied with all the Rush I need, really don't even want to hear about "new" album talk.
And in the past ten years, new album talk really never exited me, other than the impending tour that would follow. I do hope they release some alternate studio stuff, even some remixes. Strip down some of the muckier sounding tracks for example. Maybe this gives them the time to do things like that. If Hemispheres was such a chore to record, as has been said, maybe for it's anniversary release some of the alternate takes as a bonus track. All the cool kids are doing this these days.