Ill definitely back this. As someone who has already backed a project based on nostalgia and wanting to see it happen (elite), i see no reason not to do the same for firefly.
People seem to be confused here with the tv series and the universe. The tv series is never going to happen again unless its with different characters. But a space western universe using the same ip is entirely possible.
Ill see what the KS lays out, but im interested, and there seem to be plenty who are.