With all due respect, binary drivers can bugger off. As for you, shame on you for conflating userland ABI with driver interface. This has already been hashed out, many times before: http://www.kernel.org/doc/Documentation/stable_api_nonsense....

You can even get driver development for free: http://www.kroah.com/log/linux/free_drivers.html

If you want binary drivers, find another OS. As for userland ABI, people have static binaries from the 1.2 days of Linux that still run just fine.