oh yea, I didn't mean to make it sound like Sony was begging him to come aboard, apologies if I did.
As for his stance, I can kind of see it; kind of not. Koush developes / codes / hacks android, having made the Clockworkmod Recovery and ROM Manager. I believe he's also done some work with CyanogenMod, as I found that tweet when Cyanogen RT'd it. The android device platform, especially for the CM Team, openness is quite important, especially when the manufacturer tries to lock it down for whatever reason.
The console platform is slightly different, however.
I agree with Geohot on his thoughts of "do you really own that console you bought," and why he does what he's doing. hacking, homebrew, and even cfw != piracy. But it's a short trip from one point to the next. Not to mention breaking the integrity of online gaming. Sony needs some control over the console to prevent modding and hacking of online play, as well as piracy. But that doesn't mean there should be some middle ground where homebrew, emulators, and custom can coexist on the platform with the manufacturer's intent. I really think Other OS was that middle ground, and Sony pulling that is really at the heart of the issue.