I honestly don't see it any different than outrageously large diamonds, pearls, belt buckles, etc.
Back in the 70s-80's, those huge rose colored glasses were the 'thing'. Singers, preachers, directors, musicians wore them. They also wore shades as well.
I personally wear some sort of eyewear just about all the time, whether it be my Prada glasses or some slightly tinted shades. I don't think I could ever do the full blown dark sunglasses, just because I don't like the look.
James Hall is a trendsetter, and will continue to be. His music from back in the early 80's still stuns people today as to how advanced it was (and still is). To be honest, if JH started rockin neckties around his forehead, I would expect others to follow suit. It's no different from the trend that Tye Tribbett brought to mainstream gospel.