Moving about from place to place is not inherently valuable.
Imagine the price of groceries rises to 100% of your wages, so you stop running the furnace. "If being warm were so valuable, you would still do it even when it means skipping a few meals."
Welfare is still harmed by austerity and boosted by growth.
A better line of argument, IMO: a denser environment would offer more value for less travel. Or, driving to a faraway discount store is only profitable because you pay 100% for manufactured goods and X < 100% for highway mileage.