That's it basically. If GOG thinks there's a market for it, and can get the license to sell it off the people involved in the IP/copyright/trademark, then they'll grab it. To make a profit obviously, but that's not a bad thing. If the games still have value, and they're still marketable as products, I think it's good.
This isn't a forum to discuss the rights of abandonware (and especially not piracy in any form), my last post was more-so to say that I'm glad that some classics still have value to the game-playing community at large. It's even a funny case on the whole Euro-zone reselling of used software without "total company approval", considering many of the GOG's games companies went bust many years ago.
I don't actually see why a AAA company wouldn't ask GOG for their sales details and do remake's based on this. There's so many games that are dying for a part 2, or even just a new-technology revamp, but it hasn't been done. Or they've done a re-imagination which is horribly flawed or simply abused the IP (and copyrights) to keep them on their roster for later. It'd save R&D costs on what WOULD sell, considering these games still do sell, yet are behind in the technology and game-play (current gamer's wants) spectrum by ten years in many cases.
I know I'd love to see a new SimEarth for instance. It'd be amazing these days, but the original is still good for it's sheer "there is no other game like this" value.