A large part of FreeBSD is the kernel, and another large part is userland tools that support the kernel.
FreeBSD on the Linux kernel would be a lot of work and at the end of the day, I'm not quite sure Linux needs a BSD licensed ifconfig, etc?
If FreeBSD wanted to use Linux video drivers, that could be useful, but there would need to be a stable interface between the kernel and the driver, and that interface would need to make sense for FreeBSD. Stable kernel apis is an anti-goal for Linux, so that's a non-starter; I wonder if Windows drivers could be more amenable, ala NDISWrapper; but that would also be a lot of effort, and if there were effort for FreeBSD video work, I'd imagine the intel drivers would get ported faster.
What would be the point? The reason to use a BSD is the kernel. If you change the kernel to a linux kernel, there's no reason to use it over a Linux distribution.
