achaye: If Origin or uPlay had DRM-free games, I would actually purchase from them too. I guess the question should have been rephrased to "when will AAA publishers finally be able to convince brain-dead investors that DRM doesn't work, and start releasing games DRM-free, whether on their own platform or on GOG?"
I am really, really waiting for that day. As of now, I have quite literally hundreds of dollars that COULD have been theirs because there are a whole bunch of AAA titles I want to purchase, but refuse to due to DRM.
Don't make the mistake of thinking that if a game is not here it is automatically because the publisher will only release it with DRM, even if it has DRM on other platforms like Steam. There are many variables involved with considering releasing a game on different platforms of which DRM is only one potential concern. There are many DRM-free games on Steam right now that are not on GOG indicating that DRM-free is not an obstacle the publishers of those games have with releasing their game on other platforms. There are many other reasons that game developers/publishers may not choose GOG as an initial platform for releasing their games, and in some cases in the past some publishers/developers have responded to the public with reasons they chose to go with Steam for the time being.
One reason was the Steam APIs provided them with features ready to use which they would have had to write by themselves if they were to release their game standalone not requiring the Steam APIs, including things like multiplayer services, achievements, online player interaction (instant messaging, voice chat, etc.), and other elements provided by Steam. At the time GOG did not have any such functionality available and while Galaxy intends to provide some of this functionality also, Galaxy is very much steeply in development and not a stable finished product. Some developers likely have interest in what Galaxy may offer some day but are likely waiting for it to reach an official released stable state before considering it, which is pretty reasonable. If game developers were to have to implement all of the features themselves directly instead of relying on an API like Steam for certain features it provides already, then they'd require more developers, more time to complete their game, and take on greater financial risk. For many, in particular many indie developers, but also many bigger shops too - they find using pre-existing services like Steam to be better for their bottom line than an uncertain future of implementing all the bits themselves and going Steam-free. Another factor is that maybe they do decide to use the Steam APIs and perhaps they could also use the Galaxy APIs to do the same things some day - it still requires more development effort to support more than one API, and that costs money, time and human resources - resources that they might not have or want to take risks for considering the increased amount of sales they might project to get from a platform like GOG.
It all comes down to business decisions that go way beyond DRM, although it is commonly viewed by the community as being all about being pro-DRM or anti-DRM. The industry is much more complicated than that, they care about their ability to make money and DRM is just a tool, not a guarantee. Some use it as a tool believing it helps them bring in more money, while others reject the notion, but either way DRM is only one possible consideration in choosing to provide a game on the GOG platform or not.
There are even many cases where developers have offered their games DRM-free to GOG and GOG has rejected their game for other reasons such as the game not being a match for the userbase or other factors. Even Hollywood has allegedly offered DRM-free movies to GOG for their Movies section (GOG executives have announced in videos over the last year or so) and GOG has at least so far turned them down because the movie industry does not have worldwide distribution rights for individual titles and GOG asked the community if they'd accept DRM-free movies with regional distribution and apparently got back a resounding "no fucking way!"
There are oh so many reasons... DRM is only one, although it is the most highly convenient one thrown around when someone isn't sure about the why's of a particular game.
Personally, I think other than dead silence, the best reason any publisher could give for one of their games on GOG is "Because, reasons." because anything other than "yes, we're going to do it as soon as possible!!!!!" with exactly 5 exclamation points are universally met with mass hatred and conspiracy theories from the community often surrounding the cult of DRM.
But look at that, we now have Morrowind! I'm excited about what is coming next, knowing the next surprise is right around the corner. Not too concerned about what we don't have, but excited about what we'll have next whatever it might be. Then again I own 1000+ games and am nowhere close to being bored too so... I digress. :)