I'm more keen on the Soft Engine than stages, but either way there will no access that stuff without being able access / modify PS4 or Xbox content, and if that were possible it may as well be more meaningful to mod on consoles again. I know the probablity of TN throwing PC a bone is extremely small, but enough support either in money or voice could still compel them to do an upgrade if their plan is long term.
It looks like Xbox 360 to PC could become a reality, but like bbb said I wouldn't waste too much time on most DLC conversion since it's already been shown to be in the works.
I spent a ton of time on Alpha last night trying to get current tools inject regular meshes into her default costume, but there are some issues with her stuff. I wonder if she has a file size limit because most stuff wasn't working under otherwise normal conditions.