I'd be willing to bet that stat highly depends on the age group of said fans. The Seahawk "classic" uniforms does not carry any kind of legacy like the Packers or Raiders, and especially with the LOB and the ONE SB win coming out of the current uniform. The current uniform was designed with the idea of fast, speed, sharp, edgy, etc which in a lot of ways truly reflects what that LOB team is/was which can we fairly say is the best Seahawk team in history and possibly one of the best teams in NFL history? So to be honest...No I bet the majority of hawk fans of all ages (and new and upcoming fans, like the kids who were watching that 2012-2014 team) will have way more love for the current uniforms vs the classics that existed before they were born or even had memories.
I'm almost 40, I'm neither young or old. I'm probably young compared to the majority of posters here. I'd like to say that my age group +/- 10 years makes up the majority of the stadium currently. That being said I don't even have much care about the "classics" other than they are retro cool for once in a while, I can guarantee you my almost 10 year old child and all the kids in her age group +/- 5 years also give zero Fs about the classic uniforms..and like it or not they are the future of the Seahawk fanbase.
Uniform designs are going to continue to follow modern trends of design. They tend not to go back to anything unless there's just so much legacy there they can't be ignored, but that being said in the grand scheme of the NFL and Seahawks fans worldwide that extend beyond die hard seahawk fans from the original years, I hate to say it but I truly doubt there is that much over whelming love for the classic uniforms. It may only appear that way depending on the crowd you surround yourself by. Is your overall social community network much older legacy Seahawk fans? then it would appear so. But most likely far from reality.