But Linux isn't even close to being the only kernel being worked on. Neither absolutely nor from a marketshare perspective.
Hence, the comparison. Firefox and IE both comprise a major chunk of the market.
Instead, focus on solving problems. If the best way to solve a problem is to use webkit, then why do otherwise? If the best way is to go back and fork webkit from 2 years ago, and start your project from there, do that instead.
But don't be different just because you want to be different. Target your ambition toward something more meaningful.
It happens so many times and with so many things (not even software related) that I'm amazed it's not the first thing that comes to mind.