Fashion is cyclical - always has been always will be. That's the very nature of fashion. Yes, fewer women are wearing heels at the moment, and for the reasons you say. It is not the same as corsets at all. Everybody wears something on their feet. There will continue to be diversity in styles, and shifting tastes.
It is certainly easier for a guy to wear heels. I have been wearing my chunky heeled ankle boots (3.5" heels) and chunky heeled OTK boots in the old coal mining towns where I am now and do not attract any notice or attention whatsoever.
Whether or not high heels are in fashion is largely irrelevant to me. They're in fashion with me. If I was worried about what everyone else was wearing, I'd never have started wearing heels in the first place.