Best answer by Skelton
First, the HomePod isn't going to feature any input ports, so you won't be able to use it instead of a Playbar for TV audio.
Even if they could though, you're talking about some things that would probably require a Connect to manage. The HomePod (or even reasonably priced competitors) don't have the ability to "manage" the kit in that fashion.
Sonos isn't planning to have Airplay 2 support until next Spring, so that's another potential hangup.
Hope that helps, and if I said anything wrong someone will correct me .