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Installous shut down= apple stop fighting jailbreak as hard IMHO. it is great for those who really use it to TRY apps. Otherwise Installous blatantly rips off apple and it's developers.
If you believe the majority of people who use it, do so to "try apps" then go and genuinely buy them, then you're being a little naive. I would put those kind of people in the 0.1% ratio, because it exists for one reason alone, and that's to pirate apps. I'm just surprised it's taken Apple this long to focus on Installous and Apptracker.
Although, don't think for one second that killing Installous will mean Apple will relax it's stance on jailbreaking. While I'm sure Scott Forstall has a look at some of the tweaks the community come up with (Zephyr for example is a UI tweak I would expect to see Apple implement in the future), Apple's issue with jailbreaking is that in hinders the security of the device, and Apple is all about security, that closed system, and I agree with that.