ESO takes place in the 2nd Era in the years 582-583 so far.
The Great Collapse is an event that takes place in the 4th Era centuries and centuries after. The two are not even remotely connected.
I'm all for expanding the game with Skyrim themed DLC, but it will have nothing to do with the Great Collapse and other, modern Skyrim events, for obvious reasons.
first off, this would not be the next dlc. Im sure zo$ has some half baked dlc already in the pipeline ready to be shoved out despite player feed back saying its riddled with bugs and terrible combat changes
secondly, i dont want anymore dlc. just gives the genius minds in charge of systems and the combat team an opportunity to nerf more things i like into the ground.