Uh... no, the wiki isn't dead.  It's actually quite active.  Some months back it wasn't very but nowadays there's a lot going on.

Yeah, check the wiki activity and select "See all activity". You can see the stuff that everyone has been doing.

I don't think it's dead, but it's definitely less active than before. There are only like 6 active members that actually edit. When I first joined in 2014 (on my old account) it was a lot more lively. Back then there was a lot more activity and then chat was also very active. The people that really contributed to this wiki seem to have lost interest as well.

I'd say it's more than just six members.  We've got you, me, Sonicsilva1, Brudikai, Jared, Joshua, Alex, Duckstar, and others I've probably forgotten.  That's eight by default.

So, yeah. Basically it's Active-ish.