Good, I guess. For a long time the content companies have been afraid to go very far in court over some of these concepts that push the legal boundaries for fear of an unfavorable precedent.
Sadly, they'll probably just end up saddling Grooveshark with a crippling settlement. Or Grooveshark will be bankrupt before it's all done. Or Grooveshark will lose outright. But barring all those outcomes, there's the very small chance that a reasonable decision regarding music IP will occur - which would change everything.