You have to understand how many times this topic has already been raised, discussed, beaten, and buried in the past. Most regulars around here on either side of the fence are probably a little weary of it, and the discussions always seem to come down to "Is not!" vs. "Is too!" anyway.
As for "death of drum corps as we knew it," that's already happened time and again. Talk to the guys who lament the death of the pre-WWII drum corps for some perspective. Each of us has a different vision of what drum corps "should" be, but whatever our opinions are as spectators and alumni, they're not going to shape the actions of those who are actively involved in drum corps today. I don't like amps, but amps are here to stay, and me not liking them isn't going to change that. You don't like Bb horns, but guess what? Same thing. Whatever era in which any of us may have marched, we have to realize that it's someone else's ball game now. If you had a time machine (like me -- they're pretty sweet) and could go back to any year of drum corps in the past few decades, there'd always be an "old guard" complaining about how much things have changed. The only difference now is that we have the Internet. No need to fear the death of drum corps: it's happened, it's happening, and will continue to happen. It's called "change."