The FAQ at the top of the “Server Transfer Questions Megathread” ([Megathread] Server Transfer Questions Megathread) mentions that Full Server status is “… not permanent, we review the number of daily active players every day to determine Full status of servers.”
It seems like a fair number of servers are unlocking over time as the active player count comes down. I had an old tab open to the server status page and took a screenshot before refreshing. I’ve attached the before and after (shows a selection of US East servers). Only 2 of the 30 locked servers are still locked today.
I know many people are still frustrated that their friends are on full servers with the upcoming server transfer capability, but I bet a lot of people who were initially worried about this are now free to move to where their friends are. Forum posts obviously skew heavily towards those who are understandably still upset, and there might not be a great solution for some of the massively overpopulated servers. I’ve also seen some recent posts about servers with low populations that are still locked. Maybe this information will give them some hope that they could be unlocked soon.