I would imagine it could put a significant dent in the already very small percentage of people using linux. Thus under representing it even further. Not that I'm too worried about it though.

edit: Looking through the current version of the host file, it appears google analytics and some other "non-nefarious" tracking sites are commented out.

That is true, but it still conflicts with the purpose of this file, which is to "Make the internet suck less", while it instead, in the long term, may make the internet suck more. I don't see how blocking them makes it sucks less anyhow?