Overall, I think it's in the best interest of all parties to have DRM-free games digitally distributed on GOG.com.
Problem is - GOG.com is NOT the leader in digital distribution.
For better and/or for worse, Steam is the leader.
Also, this move by Nordic - this could make them A LOT of money they wouldn't get otherwise. If there's a sudden sales-boom b/c of a perceived notion of "OMG, some Nordic games are leaving GOG for good - BUY NOW for DRM-FREE versions!", I wouldn't be surprised if Nordic change their mind and decides at a much later date, "Well - we did well w/ that game-exodus publicity stunt on GoG. Let's get these games back on GOG!"
EDIT:
I'd personally love for more titles to be in the DRM-FREE World of GOG.
And I think when games at least get very old, it'd be in dev's + pub's best interest to put them DRM-FREE on GOG. This would be especially true to get gamers who had DRM-riddled version that never got their DRM patched-out (Riddick: Dark Athena, I'm looking at you) and add some of those slick GOG extras (avatars, wallpapers, soundtracks, digital art books, and any other cool stuff you can think of). Stuff like that - that can push some sales. This way, more $ for dev's and pub's - and it's entirely possible gamers could get at least double-dipped on here, for the same bloody game they already own...whether it's to get a DRM-FREE versions, just to get some extra goodies, just to have the game digitally, and/or whatever reason you can dream up.
And of course, gamers who never bought a DRM-laced version of something - well, their patience would be rewarded by buying a DRM-FREE version on GOG.