Same problem
I had the same problem w/ a SEA-BTV trip scheduled for Nov. They canceled a 9:40pm 1 connection flight, and made it two connections and several hours longer.
They were willing to refund the ticket, however my flight is right before turkey day, and all tickets have sored much higher then my original price so it would do me no good. I was not a happy camper, especially when I was meeting someone in Philly to connect on w/ to BTV. Now, we're on different flights and they won't change her's to match mine, and I can't get into PHL any earlier then my new itinerary.
Boo! Oh well, I guess it's part of working w/ US's restructuring and cutbacks.
- GH