I feel your pain. I 've gotten VERY much into Them Crooked Vultures since a few months. It hurts. They're the only band which I have hope for of seeing live. But, hey........
You asked, what happened?, well...
These three men are all amazing, talented musicians. All of them. That also means they're busy making music and all that jazz.
At this very moment:
-Dave Grohl ~ he is always busy. hahaha well but seriously, he's about to release the 8th album with his band, Foo Fighters. New album = New tour, basically. So mr. Grohl is busy
-Josh Homme ~ I'm not certain what exactly he's the most busy with atm, but in 2013 he released the album "...Like Clockwork" with his band Queens Of THe Stone Age, and they are maybe on the road again, touring and stuff, i assume; Because as I already said, New album = New tour, mostly.
-John Paul Jones ~ Ahhhh I love Jonesy so I know a lot about him. hahahah. :3 So, I know about this interview, in which someone asks him what his plans for 2014 are. He responds "2014 is full of Opera for me!!!" And then smiles so innocently and sweetly ughhhhh JOnesy <33 (because he's been working on an own friggin opera (!!!!!! He's writing a own fucking opera because he's John Paul friggin Jones and no one can stop hiM FUK YEH)!!!!!!!!!! already since.... 2010 or 2012 or something. He says it's a whole new challenge for him.) So he'll be busy with that, at least during this year (2014).
So yeah.........
Maybe 2015 or 2016 will be "the year". Don't lose hope please!!! I'm trying not to lose hope too!!! I WILL have to see them live. I believe, I'm almost SURE they'll get together again. They have to. They will. And I will see them. In real life. <33333