No publisher is interested in releasing their AAA game without DRM, so GOG is only a place for non AAA games (mostly +10 years old). I'll not count Witcher 3 in this case.
But their client has many cool features where I believe it can be a great addition to Steam (NOT replacing it! but thats what they also dont want).
The cross play feature is pretty cool and I'm glad Valve is supporting it. I'm not really a fan of Origin because it's Steam in a different case but this client, GOG Galaxy, is going into the right direction but not trying to do the same, instead to do something that fits into the missing parts.
Well spoken, that being said after my last post I did strike at a price of 20$ for witcher 3 on GOG so I will be comming along shortly fellas