I think it is safe to say that SOMETHING needs to be done, yes.
But whatever option is chosen, you cannot consider wiping these servers again. I have played Ark since the initial release on PS4 over 2 years ago now and stuck with this game through a lot. First off, when the whole thing happened with Legacy servers and people were faced with having to start over again, the number of people that quit was large. Following this, my tribe went to Unofficial servers with friends until eventually getting bored and quitting the game for several months. We had done everything on the game and there seemed nothing left to do (everything was kept below 2x rates, nothing extortionate).
At this time we were more or less done with Ark, until one day an old friend showed us some screenshots of Primitive Plus with the different structures and things we hadn't seen before on Ark: Survival Evolved. Now almost a year on in Official PvE, we are the largest tribe of any of the servers and still enjoying the game. This is what Prim+ does in my opinion, ives players a chance to experience something new on Ark when they feel like everything has been done and it is something different from the main game. In the time I have been playing on Prim+, I have seen countless people come and go, mainly leaving because of the numerous problems we encounter on these servers and because there always seems to be something wrong. I have always understand how these problems occur, but never undweerstood why developers seem to forget about the problems every time. Heck, if you need to release updates a week later on Primitive Plus to make sure everything you change doesn't affect the mod, then I don't think many people would mind at all.
Now, after a quick scan I think the only viable option suggested is to make Primitive Plus part of the main game. It is already on every platform. But, I can confidently say now that if these servers are wiped then they may as well be deleted because the vast majority will quit playing. Not just Prim+, but Ark. Whatever option is decided upon, it should be a priority that there is no wipe and everyone keeps what they have worked towards, because it was a lot harder to do in a smaller community.
This comes from a PS4 Primitive Plus PvE player.
Apologies for any typos, but thank you for reading and finally looking to do something with this neglected game mode.
EDIT: To be honest, I don't see why you cant make it part of the main game's files but have it remain as a separate mode. That would keep everybody happy.