If you take it as a one off maybe it is more difficult to make the finances add up. However given the groundswell of change happening right now, political willpower to change, private funding, corporate support and public support these changes look to be inevitable. I think you need a bit more of a can do attitude than a meh looks impossible to me why bother mindset.
In the case of hydrogen - it isn't that difficult. You develop on site hydrogen production capabilities and replace the fleet returning to site to re-fuel. Self contained.
Getting rid of the old infrastructure - good local jobs to do that, and upgrade it with something new. Come on now, that was too easy.