How long will it last?

Upon Hubby's recommendation, I've been using GrooveShark for my online musical needs. Previously I'd been using Pandora, but I like being able to pick exactly which songs I listen to, and there aren't any of those annoying Jaguar ads. (I understand Jaguar is trying to broaden their customer base, but seriously, that probably means 50-year-olds and not just 60-and-up, is Pandora truly the best way to reach that target audience?) I'm no longer limited by a couple of artists for my theme and I can cross genres. But I wonder how long GrooveShark will last; surely the RIAA will find a way to shut them down. But until then. . .