Yes, there are fewer corps, and for a variety of reasons. As someone who has seen drum corps change through the years, one thing I miss is the variety in the corps identities. What the members do individually on the field today is absolutely amazing. No doubt .... Is this the Golden Age? Yes and No, depending on one's perspective. And the brass quality being better? Probably so. We don't have as many people "off the street" participating any more. There ARE many more activities for everyone to do today. One thing that I don't want to see is a lack of respect for what it took to get the activity where it is today. Much like I would hate to hear Lebron and Kobe talk about how crummy the athletes were back in the day. I would hope that each corps member would appreciate the history of individual corps, see where they came from, and how time has changed the activity.
Maybe it's the way that I took it when I read it, but I hope the original poster can appreciate the "old days" and the people that participated then.