Can you give some examples of the above though? I wanted to comment but it's too vague :)
I wasn't thinking about anything new or revolutionary, just the usual (that I already mentioned some days ago in a similar thread), that some months (or even one or two years) after release the publisher and Valve could simply remove the "mandatoriness" of Steam, for example by allowing Steam backup to become "real" self-contained backup that could be restored and played without needing Steam nor needing to be online to reactivate the game (making those backup effectively DRM-free installer)
It would be win/win for everybody, publisher would still have the piracy/second hand sale "protection" of DRM during the initial release period, Steam fans would be able to continue using all the Steam features they want, and those who care about DRM-free games would know they have access a version they can backup/install/play whenever they want without it being tied to Steam.
I'm not so sure how feasible that is. I realize this is Gog and that essentially that's what they do, no-DRM installers. However practically every game on Gog is a game that has already passed it's normal sales period and is stuff that would be in a bargain bin in most places.
I doubt even the publishers who have games here on Gog would be willing to allow a no-DRM installer for their newer games within a few months of release. I guess a few years might be up to the individual publisher though, that might be feasible in some way, though you could question whether they would use that option. As long as most people use Steam anyway, the extra work involved may not be worth it. (I remember even for the Witcher 2, by far the most sales were on Steam, and that's like the one example you could use for a 'new' game that went DRM free rather quickly)
I personally think that no-DRM isn't feasible if used platform wide. At the moment, it's a small thing, for games that the bulk of the populace isn't really that interested in, or at the very least in most cases has already outlived it's financial life. But if even the newest games were being released no-DRM free, then it's only a matter of time before people start realizing/get accustomed to the idea that they could just as well get that game from their next door neighbour/friend/at school, whatever, and it wouldn't cost them a cent, or they could share costs.
I think in the long term it would start hurting sales, or force prices to go down to a level where making games isn't feasible for studio's, or at least not on the level we've gotten accustomed to.