Yeah, I just assumed, with the end of the Soul Key and the coming time-jump, that we'd just have a 5 year period in which Taran'atar is bombing around in the Gamma Quadrant, and the Ascendants are slowly gaining strength. They have a leader now (or something), but that doesn't mean it won't be a while before they're ready to deploy.
The Terok Nor trilogy is full of all kinds of religious visions that foreshadow events many, many years in the future. It's not at all unreasonable for Kira's visions to foreshadow events 5 or 6 or 7 years off.
No, but it does violate the creative conceit that the DS9 Relaunch had been operating on previously: That it was a heavily-serialized story with many important events happening in rapid succession, with relatively little time in between crises. I mean, the period between March 2376 and March 2377 had -- what, the rogue Jem'Hadar crisis, the Bajoran Reformation crisis starting, the Ethan Loken crisis, the Gateways crisis, the launch of the Corps of Exploration, negotiations between the Bajoran and Cardassian governments and their collapse, Thriss's suicide, the start up of peace exchanges between the Bajoran church and the Oralians, four separate crisis in the Gamma Quadrant, the assassination of Shakaar/Parasite crisis, the crisis on Andor, the Cardassian rebuilding arc, the Trill bombing, the start of the Mirror Universe crisis, the ongoing events Jake had in the Gamma Quadrant, the ongoing Mirror Universe crisis...
... and then suddenly we go from all that in just one year and skip another five years?
That's a pretty fundamental break from the DS9 Relaunch's creative conceits.