I'm happy for them. They have killed it... absolutely killed it... what...? Seven times?
At some point you want to break out of that golden shell you've built for yourself, and do Something Different. I'm happy they have had the success they have had. I am happy for the music they have created. And I'm happy that they are calling it quits on their own terms.
Maybe someday I'll be lucky enough to get to quit something epic! :-)