I honestly do not see how you can come up with the conclusion that OC corps do not care about Legacy fans. Of course they do.
The hard truth is, Many OC Corps are busy trying to ensure their SURVIVAL, so they are focusing most of their effort there. You will have no OC Corps to be a fan of, if they do not focus the Lion's share of their attention on the growth and health of their own organizations.
Many OC Corps operate on a 100,000 or less operating budget (and even some presently active touring OC corps on much, MUCH less). They also have vastly less of the most important resource: PEOPLE. (think: Volunteers. Afterall, Charity Golf Tournaments, Poker Tourny's, Silent Auctions don't run themselves, Grants don't write themselves, and the bigger the Corps, the more parents you have to help. Volunteers are the essential lifeblood from which all good, healthy non-profit organizations come.)
(ASIDE:) How do these OC Corps grow? By ensuring they focus all their attention on creating a FABULOUS member experience. Happy members stay in the Corps, and bring their FRIENDS! as the corps grows, so does the level of support. It's all connected, but back to my original line of thinking:
Now, compare the OC Budgets to the operating budget of some of the WC corps. - Some have as much as up to 5 million per annum to work with, (I kid you NOT) Big Corporate Sponsors, Huge fan bases, huge support teams, Merch sales, advertising support, appearance fees, enough funding to spawn companies dedicated to earning money for their Corps' continued operations, etc. etc. They are models of success.
But with that kind of contrast - suddenly, you can see why there isn't a nationwide movement of OC Corps trying to win back the Legacy fans. They are busy focusing on operations, and trying to ensure that there IS an OC here to serve the kids we care so much about. It's about the KIDS.
OC loves and values their fans too, and realize they are important, but many of these corps play to small crowds day-in and day-out, and aren't reliant on the merch sales, DVD sales, crowd attendances and appearance fees to make the clock tick in the same way that the WC corps are. They are simply trying to ensure that their valuable segment of the activity is here to continue enriching the lives of young people throughout North America for years to come.
It's a question of economics, really.