Maybe more families will do what my family did, and find interesting vacations that aren't so far away?
Growing up near Buffalo, I remember some of the coolest family vacations we took as a kid were to places like Burlington, Connecticut, NYC, Boston, Corning, the Adirondaks, and Toronto. None were a lot of gas away, and they all made a fun weekend (or longer) family vacation.
We got down into the Carolinas and Georgia too, but when we only had a week for a vacation it was fun to go somewhere closer, save some gas, and spend more time on vacation than on the road. Maybe the gas prices now would only have allowed us to go to NC instead of SC, but with what most people spend on a vacation the extra tank of gas isn't going to break the bank.
Given the number of people I've met since moving to California who've never been outside of California & Baja Cali, I don't think taking nearer family vacations will change the plans of many families. Unfortunately too many families are now too busy in their minds to take off for a week or more together.
Dave Hogan