I'm sure he won't be leaving bitcoin but as he says that he will be retiring the application, I suspect that he was sick and tired of being coerced to pick sides all the time. I'm sure many old timers in the bitcoin space would have an equally hard time in his place.
If it were me I'd link to the white paper, the core wallet and blockchain download and not much else.
I wouldn't list any third party services. I would regard layers as someone else's problem to educate people on. I'd want to keep it as a place beyond whining and politics. I think they're doing a very nice job with it considering the potential it has for mess. I'd still want to strip it back further.