From what I've been hearing, there is a big push in 12 states to create racinos which combine horse racing and gambling. Doesn't sound great but in one state its revitalized the horse industry, created 40,000 jobs over a 5 year period and increased the stud fees and purses as well as encouraged people to buy more farming equipment, more farm buildings, etc.
The other big trend is fairgrounds are expanding and including more horse events, in some cases horse racing. Could be trotters or TB racing or QH racing don't know all those details yet.
As far as horse show trends and breeding I haven't seen anything about that in the horsey news I get on google alerts and from some of the people behind the economic development. If you need more info for your paper, I can send you the links. Would love to hear what other people know about horse industry trends.