This technology could be revived, with more modern and
cheaper electrolyzers, and the advent of methane cracking and small modular reactors would eventually allow ammonia production anywhere in the world.
That may be changing, well, actually, since global warming is being down played and the economy sucks, it will take longer, but
cheap solar panels (nanosolar) and relatively
cheap hydrogen fuel cells (Ballard power package handling units in production) with small to medium scale
electrolyzers are pretty close even with not so great hydrogen storage options.