Not sure on Android. They already work on some replacements. They probably will have some mobile OS for the long-term future, but not sure if that will be Android. But there probably will be some compat layer, at least for the beginning, when/if they plan to roll out some successor/replacement.

Maps as a user yes. As a website owner it fucked over millions of pages with its exorbitant price hike.

Maps! Yes, how can I forget this gem? Search is how we usually define Google so I thought it best to leave it automatically assumed.

On a personal note, Keep is something I would love to have around for the foreseeable future since I use it a lot.

And AdWords, obviously

The thing that shocks me about Google Voice and the fact that it's still around is that it is routinely abused for nefarious purposes. IIRC there was a series of bomb threats made in the US to which the perpetrator was simply using Google Voice and a VPN to mask their location.

I believe Google Voice got a shot in the arm because of the Google phone plans (Google Fi) merging some infrastructure behind the scenes.

At this point, it's probably safe to assume that Fi and GV will die together ...