I'm not worried about nerfs yet.
Cuchulainn in Void Ark was a mess in DF for awhile and SE didn't adjust it. It got smoother as players got more experience with it. If we're still seeing low clear rates a few weeks from now then SE may adjust it.
I haven't beaten it myself yet but it seems like a pretty decent difficulty. The one group I tried it with got stuck on Ozma but we were definitely improving.
