Wasn't this the same argument being made for EVs? Literally infrastructure, cost of production and the cheapness of oil were all major arguments for a lack of success and growth.

Then economies of scale come into play to make things cheaper as per batteries. Plus it's Toyota and they are well known for industrial processes (they also own a part of Tesla, no?)

What's the issue with having Hydrogen/EV's together? Diesel and petrol had no issues.