I don't think English-style reduces participation. ....and I'm not so sure overall participation is declining. It seems to me that there are more shows across the country than there were 7 or 8 years ago.
There are a number of factors that hold back growth in participation. Probably the most significant is "club politics". When it is a competition among friends, it is fun. When it is an uncomfortable reminder of disagreements, the fun is gone. The progress of the koi hobby in the U.S. seems to me to have resulted in more divisions and differences as kichi become self-segregated from the more casual koikeepers and their watergardens.
Another factor is that U.S. shows have greatly improved in the quality of the fish shown. To be competitive takes significant investment. Among those with the means, many have very little time to travel, take days away from their business, etc. It takes quite a commitment to show koi. For those without the means to be competitive, the only reason to show is to help the club. When the result is overhearing negative comments about the ones brought, it does not encourage continuing... Gotta have a thick skin, but a lot of folks don't. It takes a certain type of person to receive criticism, and experience loss, and still keep coming back. We would not expect the owners of mediocre poodles to enter an American Kennel Club show. We should not expect koikeepers to be different.
Closely related is the factor of size. The koi winning major awards are larger than they were 10 years ago. That means a large pond is required and the work involved in moving a 30"+ koi is not lightly undertaken.
Despite these factors, and others, I expect we will see significant growth over the next 15 years. As the babyboomers retire with greater means than prior generations, we will have more folks with both the wherewithal and the time to partake. ...Of course, that assumes the internet addiction does not gain total control.
