Anyone else get that vibe?
Not even close. They've signaled from the start that this is permanent. In the closing 2-parter of season 2, it was stated explicitly that
Discovery could never return to their own time, that the Sphere data was inseparably fused into the ship and that the ship therefore had to be kept out of Control's reach forever. The plot and emotion of the season's last two episodes revolved largely around the crew
knowing that it was a one-way trip and choosing to make it anyway.
And in the season premiere, one of the first things Burnham learned from Book was that all known time travel methods had been destroyed before the Burn. After all, it's been a century or more since the Burn; if it were possible to reset it with time travel, someone would've already long since done so. This was the second way that the producers told us explicitly that this is NOT just another cliched, short-term time-travel plot.
After all, for two years, the show struggled with the difficulty of reconciling new storytelling and ideas with established 23rd-century continuity, and fans complained constantly about the clashes with how TOS portrayed that era. It seems clear to me that the producers want to leave all that behind. The very fact that they jumped forward a full 8 centuries tells us that they wanted to break with the past in a
big way. If it were just another lazy time-travel reset plot, they didn't need to go that far ahead; they could've made it the 26th century.
Not to mention what a terrible waste it would be to do all this worldbuilding of a whole new era in the Trek universe, to devote a whole season to that, and then just erase it all. That doesn't even make sense. It would be incredibly frustrating to the audience, a huge and infuriating tease. I don't think they'd be that foolish.
Not to mention that the show is finally, finally
working more smoothly than ever before. "Forget Me Not" was the most brilliant Trek episode I've seen since DS9. The show is immensely
better in the 32nd century than it was in the 23rd. It's finally found itself, finally freed itself from the limitations of navigating around 50-year-old canon. They'd be out of their minds to undo that.