Sibling commenters mention industrial uses, sustainability means far more than just cars or electricity, part of why the focus on electric/cars is so short-sighted (never mind the issues electricity distribution brings to the table)...

But for cars/electricity, this is potentially excellent news (assuming longevity and cost of the operating equipment). The distribution costs are much lower than Hydrogen, and it could be used easily to power existing Hydrogen fleets. I'd wager this even makes electricity distribution easier, as ammonia batteries could be relatively stable and easily distributed as well.