In the heady days of the housing bubble when the median home price in California was $576,000 and the general fund enjoyed a surplus in 2006, the state spent $18.3 million on three mobile hospitals for use in massive emergencies. But in a time of austerity, Gov. Jerry Brown and lawmakers chose last year to eliminate the $1.7 million to refresh supplies and ensure that an army of workers can build a 200-bed hospital in less than three days. The state found a one-year stopgap, but it must soon decide whether to maintain the hospitals or dispose of them.