Most of the best WIndows OS release have been incremental. 95 to 98 to XP to 7.
Generally the best thing about a new OS is that they are designed to run better on new tech (and often support new tech.. ie include drivers that older OS's). Thus it's nice to have Microsoft put out a decent version of Windows every 5 years or so to deal with new technologies that came a long.
It's still only been 5(?) years since Windows 7 came a long. Will people be in a rush to get the new OS? Maybe?
Will the new OS make people more likely to start buying windows based laptops again? Probably.