I started reading this discussion and it was getting long and redundant, so I stopped about half way. I apologize if I am repeating anyone here.
When drum corps circuits, be it DCA, DCI, or whatever, legalize things, they are not requiring them. In other words, when amplification is allowed, it doesn't mean a drum corps has to use it. That eliminates all discussions based on cost. The corps with cash have always had the best equipment, but it doesn't make them the best...and never has.
The rain and electronics argument is actually a moot point as well. With the advancement of weather detection and electronics that can be used underwater, it is possible to have a safe electronic experience in drum corps. If someone gets electrocuted from this, they were not safe with their electronics to begin with and are at fault.
This only leaves the tradition versus modern argument that will always exist in drum corps as long as drum corps remains in a dynamic state (which is equivalent to being alive).
These rule changes that occur in drum corps do not hinder the activity. The rules that were in place were the hinderance. With the elimination of these restrictions, it makes for a situation where corps can experiment more freely, but at the same time makes the evaluation and the definition of the activity more difficult. It blurs the boundaries that made drum corps drum corps. But because drum corps has always evolved and restrictions are always being lifted, one's definition of what drum corps is is a dated notion. What the concept of drum corps is to a marcher of today is different from someone who marched junior corps in the seventies.
What the drum corps enthusiasts must remember is that this is not the fault of any governing body in the activity. There is nothing in the rules that ever said that drum corps cannot still perform on G-D valve-rotor bugles and force rudiments into their drum books. There is no rules that say that color guards have to dance and drum corps have to pit any of their instruments. The rule changes actually eliminate restrictions and do not change drum corps at all. Drum corps and drum corps alone elect to change drum corps. The people who design shows are defining drum corps, as they always have, with the support of people who run the corps, the people who march in that corps, and the people who pay to watch these corps.
In summary: It is solely your choice whether to like drum corps in its present state or not. It isn't your daddy's corps, but it still is an amazing thing to behold. The joy of performing and socializing is still the constant and is evident among the members. Personally, if the Blue Devils or even a no name beginning drum corps is performing near my town with amplification and a reed section, I will still be there to check it out with an open mind and an eye out to see if the marchers are still digging the activity.