As a daily driver of hydrogen fuel cell vehicle I experience that today, if I can manage with just 45 pumps in all of California some constantly broken down, and still do 15,000 miles/year it should be fine even if many pumps disappear.
Gas stations may become primarily supercharger points, and pump maybe in one corner as a legacy, i doubt it would completely disappear as long as old vehicles still ply the roads in numbers.
From public transit to government subsidy for people economically unable to make the change there are many policies we can effect to solve this problem. Indirect subsidy of Gas[1] should not be one of them
[1] Without a carbon tax on emissions we are all already effectively subsidizing the costs of climate related economic impact of floods, droughts, forest fires so on.