What happens when PC manufacturers lock Linux out and only support Windows Boot for security?
You know how some Linux fans say, "we should try to make Linux more popular", and other Linux fans say, "we don't care how popular Linux is, it does what I want?" The people saying they don't care need to STFU. Why do they think hardware manufacturers haven't locked down their hardware already?
When a enough people call up the company and ask, "does your hardware have Linux drivers", they're going to write Linux drivers, but there's definitely a critical mass, and not caring what anyone else thinks makes it harder to reach that critical mass.