If you mean like the change from 1.0 to 2.0, we'll never get that again. That was a big hail mary to save a floundering game that was costing the company a lot of money. It was like a Spirits Within level disaster for Squeenix, and it's kinda nuts that they didn't just cut their losses and shutter the project. But now the game is one of their most successful ongoing projects, so they have no financial reason to rebuild the game a second time. Sure, it would be nice to have a game not built on spaghetti code that could reach greater heights, but from a business perspective, there's zero reason to risk what they currently have as long as the game's numbers are continuing to climb. A bird in hand is worth two in the bush and all that.

If you mean like a WoW esque cataclysm, that likely won't happen either unless they are able to only destroy stuff just enough that the general landscape stays the same. Something like the mountain exploding next to Komra where they can instance it between players who are far enough in the raid to see it and those who aren't. It's visually different but doesn't affect what people can do movement wise. Since unlike WoW, XIV is sticking really hard to the idea that you play the story from start to finish instead of just jumping into whatever is current, they aren't going to do anything to the landscape that would make the early game not work. And they likely also aren't going to have two versions of every zone since that would split the playerbase between those who are at X point in the story and those who aren't, which would make certain areas suddenly a lot less populated.

That said, I wouldn't mind if they left the time bubble. NPCs at least can be changed without affecting instances too much.