I'm not sure if the 360 is cabebal of working with game's engine or even know's how to handel it. It might crash and burn if its not made to be messed with, but on the other hand, if microsoft made it, they might in some future to some degree change the 360 to be able to run other windows based programs and such. Don't raise any expectations, such changes and modifications may take long time, pending on how the 360 engine and programming is done, even if done, it will be limited towards windows based programs and would need some heavy tinkering for it to work well on any other program.
Thinking about it ti would be wondefull to be able to make other programs work on the 360, the only disadvantage on the 360 would be its lack of momory, (windows requiers atleast 30gb) so it would also have to be pysicaly modfied for it to work. Having to enhance the entire machine for it to be able to launch windows based systems and hardware would cost millions upon millions of dollers of research, becuse of the diffrence betwean a consol and a pc.
Think about it, would it really be work the trouble? Why not just buy a laptop?
I'm not saying its nessarly a bad idea, but the whole trouble of getting it to work would in the end, result in some not-so-well-done-peice-of-junk. By the way, Why on earth would you even want bl for the 360? Its a 100% pc game!