It seems odd that one minute, a company needs to spends millions on maintaining a fleet, then, next thing, they don't need it anymore!
Public image is one major change. They can't be seen to spend a lot on transporting their corporate personnel while paying peanuts to the lower echelon staff and squeezing the last dime out of any contract with a customer... and then there's the climate of course.
The one I can think of is Shell, they still run a couple of Falcons (8Xs I think).