Most likely never or at least not until they decide to close official servers, but then you can’t really play on official servers anymore 
I completely 110% agree that official servers need a wipe, and not just a single wipe, but for example a yearly wipe.
They could split the different server types in 2 groups where one group would wipe in June and the other in December.
Perhaps offering a character vault where players can store a few NAKED characters if they really want to keep character progression, personally I would be fine without it, but there are likely some that would want it.
Anyways… We can suggest and dream all we want, it likely won’t ever happen even though official servers definitely need it in more than one way 