I don't consider Arc to have died, incidentally. You used it to say that, and I'm using it to reply. If I ever retired from YC I'd probably start working on it more actively again.
FYI... I still use arc for certain projects and still have hope that one day it will get the attention it deserves. I know you've taken a lot of criticism about Arc, but I'll suggest there are quite a few of us that do appreciate the work you have done so far.