Because the Snow Demons have never attacked Tamriel, for starters; it's only been the snakes
They did. They attacked Morrowind, but Vivec flooded the place and defeated them.
If dragons can leave Akavir, and Akavir can invade Tamriel including a large battle near the skyrim/cyrodiil border then why cant there be remnants and the only Akaviri that would make sense would be snow demons. Thoughts?
May I ask, how did dragons suddenly appear in Akavir and fly to Tamriel, when they were extinct? Tosh Raka? You sure he's a dragon? Are you sure Mysterious Akavir is even accurate? Do you know that dragon can mean more than the literal definition?
Bottom line, get your head out of Akavir. The dragons are not from there, they have always been in Tamriel, only hidden. Akavir has NOTHING to do with Skyrim, and this horse has been beaten so much to death, we're now digging a hole to the center of the world. Akavir is going to remain mysterious till Beth feels like revealing some of it. The Kamal are not going to be invading this time, and we should just completely ignore Akavir till Bethesda releases information about Akavir.