We are also "blessed" with lots and lots of charity and even profit-making races. I don't know if area promoters are feeling the same dilution of interest and numbers.
There is another aspect of all these races: high entry fees, sometimes even solicitation of donations, along with huge bazaars designed to pry even more money out of the runners-- all of this tends to make running more of an elite recreation for the economically privileged. You could spend hundreds of dollars just signing up for a handful of races per year-- not to mention the costs of travel, accommodations, and buying the latest "high-tech" shoes and equipment.
In my opinion running and racing should be readily available to everyone, not just the well-heeled. I applaud those clubs that still hold frequent, low (or no) cost, high quality events, and I hope such clubs exist throughout the country. In our area the Montgomery County Roadrunners and DC Roadrunners hold such races and I may have missed other groups. But the overall trend is disturbing.