A bit less, with much of the reason due to the economy. I don't have a travel budget, but no one wants to be the guy with the highest T&E this year.
Other factors:
Airline reliability. Same day trips are impossible, since delays have gotten so bad.
The airplane experience. An airplane just isn't a fun place to be anymore. Limoliner from Boston to NYC has become a much better, and cheaper, option.
Airport security: This reason hasn't kept me off any particular flight, it just adds to the ambience. Those guys just piss me off.
Mike