This will be adding those problems (centralization of services, recurring costs to play your existing games, and to play multiplayer) where they don't already exist.
PC game companies are already making single player games that run on your local machine require an "always-on" network connection to "thwart piracy".
I've posted more above, but I have also posted this yesterday detailing why these multiple-clients-required games can and will personally sting you, and are a benefit to absolutely no one: https://news.ycombinator.com/item?id=18111288
tl;dr: steam doesnt tell uplay you own the game, uplay uses a separate key, it takes days to go via tech support to fix your game, or just minutes to pirate it. Google is going to amplify this already crappy situation.