i think it's jumping the gun to say they have the family demo sewn up. remember: DHS is the least attended park in WDW. and it's essentially in direct competition with uni, considering the scope of the park's content (movies, entertainment-driven stuff).
now, i used to be all, "YES, more e-ticket thrill rides in DHS! DO IT!" but RSoxNo1 actually talked me out of that with his posts in other forums. when RSox talked about how a family-friendly ride might better take some of the capacity burden off of TSMM instead of a thrill ride, the light bulb went off for me. as he has said in the past: what attraction that isn't a show doesn't require a height limit? TSMM and the great movie ride? that's pretty much it. a couple of dark rides (maybe a pixir and a muppets) and spicing up some of the shows would help stretch the day for every park guest instead of another coaster.