So the solution is to... buy more bees of the internet? Thank god we solved CCD
So, ordering more honey bee queens off the Internet seems to be a pretty reasonable response to the problem of a 10-20% increase in overwintering hive failures.
A lot of what you're seeing are probably wasps (the yellow jacket being one variety).
It would look like a honey bee. None of them are native. Native bees are orchard mason bees.
There was a great art & education & science installation on native bees at the UC Botanical Garden in Berkeley a few years back (http://www.sfgate.com/homeandgarden/article/Shirley-Watts-Mo...). I know they still have a beehive, and they might have some exhibits on native bees.
So, no, I don't see how this is unsustainable.