This post is a friendly plea to not completely remove the old GUI, as it has sadly been announced. I can well imagine that you don't want to maintain both GUIs and therefore want to remove the old one, but you could, in return, keep the old one but no longer offer support or bug fixing for it.
Personally, I don't like the new GUI. The reason is that I find the old GUI much more intuitive to use, in the way how I often use the old GUI. I would therefore be happy if the old GUI could continue to be used as a fallback, as it is currently offered.
Please reconsider the complete removal of the old GUI and continue to offer a solution for users who don't want to or can't use the new one. For me, completely removing the old GUI feels forced, as if one is being compelled to use the new GUI whether one wants to or not.
If there are other users feel the same way, please leave a comment to let the Dev´s know.