If there was serious investment in green energy. There would be large spikes in power, to have reliable baseline to power the grid. This excess power needs to go somewhere. Hydrogen seems a good solution. It takes free electricity and turns it into a sellable product. One that can be sold at a much higher cost than storing the energy in a battery and selling it back to the grid. It may be able to ease natural gas transitions as well.
The big issue is no country is taking low carbon power generation seriously. Toyota is assuming governments will be responsible now. EVs are being sold because performance, running cost and individuals environmentally attitude is better. Hydrogen requires governments to change their attitude.