I agree somebody will buy them before they disappear, but I strongly disagree on the purchasers.

I'll take Oracle, SalesForce, or Microsoft over Google any day of the week. The worst Oracle will do is start charging me more, but god only knows what kind of sleazy ad tracking Google will add. No thank you, I'll move everything over to BitBucket.

Fortunately, I don't think Google will bother. They already shutdown Google Code when they couldn't use it to increase ad revenue, so hopefully they'll leave GitHub alone.