> I can't even imagine how some kind of "unified google media" thing would work.

It's quite simple. Pay more than a few services (but not as much as all of them together) and get access to all of them. The concept isn't really hard at all. You can go a step further and give increasing discounts the more services you add if you don't want one package deal.

You guys already do it for Youtube Red/Google Play Music. It's not mindblowing to imagine it being expanded from there. There's a common account for all the services anyway, so from a technical perspective you'd have a common place to store subscription information if that's not already done.