So we are now live on 1.15. The only issue that I ran into during the world upgrades is that the Aether world kept making problems. There are is a long list of chunks that are corrupt on many levels. I tried several times to fix this, but it seems that there are issues recurring continuously. So I had to remove it for minecraft to be able to finish the process.
My proposal would be that we drop the Aether as a world. If you feel that there are massive assets that you have in the Aether, please let me know. If nobody speaks up in the coming weeks, I will simply phase this world out and we stick to the existing worlds. Otherwise I can re-enable the world for a while so that you can get your stuff out and we would then remove it. Let me know.