"Unity isn't going to drag any joe-average users to suddenly want Linux on their PC."

'What comes with the PC at the store' is what joe-average is always going to use. Always. What a Linux desktop looks like and aspires to be and how well/whether it works means nothing in this context. Nothing.

Numbers-wise, people using Linux on the desktop are: geeks (an insignificant percentage of PC users) and friends/parents of geeks (an insignificant percentage the former).

We're like flies buzzing around a very small pile of elephant dung (but it's really good dung); meanwhile the elephant has lumbered off, out of site.