it doesn't matter which automaker. Any one of them is huge. Then the next one will follow.
Honda, Toyota, Hyundai, Voltswagen, and a few others will be building next year. This tells you how well received this technology is.
Eventually, Tesla will follow because the many advantages of Fuel Cell Technology over Lead-Acid and Lithium batteries. 2 advantages I can think are: 1) environmentally friendly 2) charging time