I wouldn't worry too much about them shutting off Steam in the future, I think it's highly likely that they'll release a patch in a year or two that unlocks the game and makes it installable and playable offline.
Right now it's all about preventing piracy of their latest and greatest game and the online authentication is a way of doing that. Once the game is a few years old and sales fall (happens to any product) they'll probably release a patch to change it.
This may not be true, I'm just making it up as I go along, but it makes sense to me and is consistent with many other game patches in the past that give you the ability to play with no CD in the drive, no CD key authentication, etc.
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