In some ways the fighting game genre really never went away, but in the US I think it started to fade into the background because of the FPS popping up everywhere. Now that the FPS is basically where its going to be I think you're seeing genres that use to be the top dog starting to surface again. I'm not saying that fighting games are going to be king again, but I think you're seeing more come into view because of the huge draw of party games. 

Its almost if there's this anti-online push that starting a bit, where you want to go old school and face off against someone in the same room so that you can smack talk and see the results of telling them what you did to their sister. 

Then again I'm just not huge on playing games with or against people that I don't know for an extended amount of time, so that could just be me.