I agree, they both should come out at the same time. The best way to do that is for the hydrogen fueling stations to be able to coordinate with the manufacturers of hydrogen cars.

Some say that only the government should intervene and coordinate both so that no single private company has to take on all that risks. Others say that the market will work effectively, either with one big company introducing both on the market at the same time or with two separate companies allying with each other in order to synchronize with each other.

Many innovations have the same problem, where as a consumer, if you start using that technology, you want to make sure that there's a lot of infrastructure. The United States has usually had a hands-off policy, where it lets the private sector take on all the risk and reap all potential benefits of taking that risk. On the other hand, Japan has usually had a hands-on policy, where the government is highly involved with companies in bringing innovations to the market.

So perhaps it's not just a question of seeing whether the chicken or the egg should come first, but rather, whether the United States or Japan will be first. So far, however, it looks like Japan is winning:
http://www.hydrogencarsnow.com/japan-hydrogen-highway.h
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