Unfortunately Linux folks is a way too small market to influence these big corporations. We have to find better ways than "vote with your wallet", because our wallet is not even a blip.
You sponsor a company that SUPPORTS dual-booting instead of one that doesn't. That has double the effect of the price of your laptop: one company loses a sale, the other gains one.
While it is true for the general market, I think for Lenovo specifically the proportion of user buying at least Thinkpads because they're known good dev machines would push for a much higher proportion of Linux users.
Completely out of my hat but I would not be surprised if a good 20%/30% of Thinkpad users are Linux users.