I am no fan of Hydrogen as a fuel. At least not for cars. It takes more to make it and it can offer up as a fuel. All the proponents of hydrogen cars usually have ulterior motives.
BUT... I think that changes for the the aviation industry. The fact remains that batteries are incredibly heavy and expensive and they simply are not power-dense enough. Those are all issues for a car, but even more so for a vehicle that flies. Hydrogen could very well be a reasonable alternative for the aviation industry. Hydrogen isn't particularly "green" to produce now, but there have been advances to make it much more so in recent years. I could see that being the fuel of the future for planes.