Will Civil War re-enactors eventually wander cities in uniform to congregate at streetcorners "simply for the objective of showing off their 'cosplay' capabilities and marveling at the outrageous attire of fellow otaku"?

If Japan is an indicator, yes.

p.s I was stopped at a light in Baltimore a couple of years ago and became fixated on reading and rereading the ungrammatical bumper sticker in front of me. It was trying to say, "In case of rapture, this vehicle will lose its driver." As I untangled the syntax, my car became surrounded by jaywalking otaku - ever increasing numbers of otaku. Ah, the rapture has arrived. After I came to my senses, I noticed the hundreds of insanely costumed strollers were filing into the convention center for an anime confab.