Out With the Old?
After Windows XP seemed to hang on for ever (and, it must be said, is still visible in many corporate environments), it seems that Microsoft is eager to rush Windows 7 off the stage much more quickly. I suppose it makes sense: The experience the company had with XP indicates that they'll pretty much have to pry enterprise fingers off the Windows 7 keyboards if they ever want to move the entire user community to the Aero interface.
I think it will be interesting to see whether, in the long run, Windows 8 and 8.1 have the sort of longevity that XP and Win 7 have enjoyed, or suffer the fate of Vista and are seldom spoken of after Windows 10 comes to market. I highly suspect that the answer will be closer to the latter than the former.