I kind of wonder if we’ll see more interest focused instances continue to be a relatively regular occurances. I could see communities around specific games deciding to make a new home for themselves if for no other reason than everyone gets a new @myfavorite.game handle and you can customize a little more to their tastes. I think it might still lean more heavily towards generalized instances but maybe the main reason to run a new instance will be to be interest focused.
As far as I know, the Xbox One and PS4 started the trend of reading nothing from the disc after install. The disc just acts as instalation media and a physical authenticator.