I can get logged in, although all I can do now is spin the last logged in character. I cannot select a different character or any menu options. I'm only left with force quitting. Oddly enough, I was able to create an Arcanist before these troubles started.
FYI - usually big ESO updates require you to remove and re-add ESO to System Settings > Privacy & Security > Accessibility before the world spinning issue resolves (oddly enough it did not happen to me this time). Have you tried that?