CarChris: Why would one say that? Especially one who made this praising thread about a year ago?
In any case, even IF this would happen, I guess they would make an announcement about 2-3 months prior, for us to download our games. For example, in autumn 2252, they would send e-mail to the implanted PCs in those living people's heads, saying "We are shutting down on 1-1-2253. Download your games."
Assume that GOG may go down fast without a lot of prior warning and backup your games accordingly.
Not all companies that go out of business have the luxury of planning 2-3 months prior to their demise. It may be either extremely sudden or otherwise, even if they realize their fate ahead of time, they may lack the resources/autonomy to do much of anything.
It is a mistake to assume that corporations are stable entities that can be depended on in the long run. They are not.
Governments are better (when it is not a banana republic), but the best is a world-wide decentralized entity.