As someone who does not want to see anyone quit the game especially for something they had no control over; such as a massive migration and subsequent depopulating of their home servers, please consider transfering at least one other main character onto Orien.
My guildies and I have had a long talk last night and at this point both Cannith and especially Ghallanda seem to be teetering into 'low pop' server status. I personally believe that eventually Ghallanda will turn into another Wayfinder a few months after the migration window ends as people either quit or just start playing on another server.
It's time to seriously consider your options and think about the future. Shards can be regained eventually, along with guild amenities and mounts. Playing on a <100 person server is probably permanent. Best of luck to us all, thanks for listening.