I personally think, Sun should just adopt the Linux kernerl and maybe only turn Sun OS to yet another linux distro. Why? Well I support linux and this will be good for it! Plus, Sun is a systems company, not a software company, yea Java and all but if you read their financial reports all the money come from large projects, hardware and systems Sales, software revenue are minimal to them. So adopting Linux will be good for Linux and maybe save them more money than they make from Sun OS.
Finally I want one of those machine drools will look awesome on my desk, people will think I am the ultimate geek drools
Frankly, I'd rather roll my own dev box, thank you very much.