I play PvP 75% of the time and I think I can keep using them for nonlevel bases crucible. I got to use all my weapons that I grinded for a lot on PvE. If I keep them, and even If they could be ascended, I wouldn't use them. Just because Fatebringer is in my opinion the best primary to use on an arc burn nightfall, doesn't I will use it on every single nightfall you know? Would I like to have the chance? Yes. Would I use them over the new weapons that got me hyped long before I bought all that new content? No.