There has been a change,but Grappling will never disappear. Fans overall are pretty stupid,but free style wrestling is still pretty popular around the country,especially at the high school levels and if fans can sit through a boring free sytle match,then I doubt they will quit watching because of slower action.
Fans booing is just something people do. Its kinda of stupid,but if they pay there tickets and wanna boo,let them.
Hopefully Dana knows the majority of fans wanna see action,but they dont wanna see Grappling disappear and they strike the right balance.