Where did Train go and why did they come back?

I remember when I first heard the band Train back in uh....2001 (sorry I had to google that). 2001, I was a sophomore in high school at that time and I really liked that song "Drops of Jupiter" but eventually it got old and I didn't like the adult contemporary sound; I was slowly turning towards punk rock and let's face it The Dead Kennedys probably wouldn't approve of Train. The band has been together since the mid-90s, that is a stinking long time!!
ANYWAY....
I'll get to my point since I'm not really clever today (it's a billion degrees outside in Texas, again, and it zaps all my brain power).

WHY DID TRAIN COME BACK?????
I am SICK, SICK I tell you of that stupid, pop, crap, dirt, yuckiness "Hey, Soul Sister" it really needs to go die slowly in an elevator somewhere in Manhattan. I'm really not a fan, I've tried my hardest to sing along to the catchy beat and love the obnoxious ukulele but I just CAN'T.
To further cement my dislike of Train there was their performance on America's Got Talent. Did you see it? No? Check it out on youtube....
http://www.youtube.com/watch?v=wzT9SQfMEDc

Do you think it was a good performance? For a band that has been around since I was like 8 or 9 shouldn't they know how to perform in public? Or maybe is it just because they are aging and the lead singer just can't hit those notes anymore?
If you have a different opinion and would like to correct me or convince me that they don't suck by all means give it your best shot!