Gas stations have a lot more shots at survival than just FCVs. In 30 years gas stations will likely deliver a wide range of different vehicle energy sources: fossil gasoline, Fischer–Tropsch process gasoline, fossil diesel, biodiesel, CNG, and hydrogen. The only business they will lose are people who can charge or refuel electric or CNG powered vehicles at home. Those will still be a minority in 30 years due to slow turnover of the vehicle fleet and limited availability of home charging stations.