I did not get his definition of "you will win". What would I end up with in the end? Yet another browser that does exactly what FireFox does: reliably displays web content.
Presumably the parallel browser would be faster and maybe even BeOS-smooth. It's not clear that this is enough justification for a new browser.
I am totally not convinced. What are the tangible benefits of doing this? Looks like he just is suggesting changing the internal architecture of the code without any specific reasons for it other than elegance. A web browser is an extremely large non-trivial program, and rewriting it just to use some new idioms is pretty nutty.
This looks more like using a new rendering engine as an excuse to develop a new programming language. Which doesn't sound too unreasonable, but if that's the goal ROC should be upfront about it.
that is actually a pretty neat idea. but i think it would be hard to release often when doing a complete browser rewrite.