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#11
Don't take Vista as an example, just remember that it was one of the worst OSs MS did, and of course a natural move was to make it disappear as fast as possible. Win8 is also more oriented towards the Vista way too.
Better consider the move from XP to Vista, when XP remained a long more time.
Nevertheless, it don't matters that much anyway. Once you manage to get the disc, Win7 will function normally as always did. And for the keys, MS will for sure have online stores for buying them if you need more, most likely.