Well, what I believe is that there's a time and a place for everything, and in the case of ska that place was the mid 90s... America's teenagers needed something to feel good about after the onslaught of depressing (but still totally awesome) grunge of the early 90s.
So there was Save Ferris, Big Reel Fish, etc. etc. And even the early No Doubt (whom I was a HUGE fan of for years) like their Tragic Kingdom album and Trapped in a Box.
But ska is no longer needed, we have other music to enjoy.