I don't really see a massive run on people trying to sell or return their car. I'm sure a few will to try to make a point, or perhaps to try to get a new car out of the deal.
That's my prediction for the record!
Isn't it possible that running these engines at the EPA recommended levels just isn't possible? That if they were to run like this 100% of the time, reliability, mpg, or power would be greatly reduced for various reasons?
There is a reason they took this huge risk to put in the cheat (but maybe management didn't think it was a big deal). It seems like there is too much risk involved in cheating for just minor fuel economy and power gains.
I read elsewhere that their technique for cleaning the exhaust can gunk up the filter more quickly too, so it might also change the maintenance schedule. Which, again, may not really be a huge issue for a car owner, but could impact VW.