How could Windows 10 help?
So far as I can tell, each new release of Windows improves efficiency and decreases the system foot print and hardware requirements. I would imagine that Lenevo needs to make money from being innovative or trying to be sexy.
The market is completely saturated today. Faster CPU, RAM, SSD, etc... don't make a difference. When everything is already faster than any of us can complain about, making them faster doesn't make us run to buy more. Also, computers are lasting 5 or more years now before becoming out of style. Nearly 10 before they're too slow. I still use a 2011 Mac Mini for most of my iPhone development and all I did is add and SSD to make it fast enough. My desktop PC is a Core i7 2600 from years ago, it's still REALLY fast. We don't need better PCs.
Thinner, smaller, faster isn't really practical anymore. My laptop is a Surface Book i7 w/ 16GB and 512gig SSD. It's bigger and bulkier than the Surface Pro 3 I used for a a year or two. It was worth it for the bigger screen and higher resolution. I wouldn't pay for another laptop for higher resolution though.
Microsoft and Apple are selling computers because they're cool.... Lenevo doesn't go for that. They should buy Vaio and fix that.