I think SE have done a great job promoting the 26” and 29” bikes. I can totally see why they’re so popular. The vids of people wheeling down the road look like all the fun things I remember BMX being when I was a kid.
I’ve thought for ages that there can be a perception there’s a massive learning curve (or complete lack of fear) to get into BMX these days and it probably frightens people off. BITD it was way easier to do tricks that you saw on the TV. Wheelies, endos, even managing to get a couple of front hops done. So wheelies on a big bike are much more accessible.
GT have made a good stab with the latest 26” Performers but I think Haro have gone the wrong way with just making expensive copies of what their classics. They should do what SE and GT have done by creating classic style frames with modern features but around the £599 - £899 price bracket.