We're currently on our 19th Crown Crate Season, the Iron Atronach Crates. This month, number 20 will be releasing (Grim Harlequin). Q4/Winter 2021 will see the release of the 21st Crown Crates.
ZOS should bring ALL OF THEM back for Jubilee 2022. It's the big anniversary Event, so why not use it as the opportunity to bring all the Crates back during it? Even if it's something like a different Crate each day! There are people playing this game that have been waiting YEARS for some crates to come back!
And there has never been a better time for it, now that Seals of Endeavors are a thing and Radiant mounts can be purchased with Gems!
And it should be a tradition going forward as well, assuming things maintain the status quo.