There's something about your target audience I think you're overlooking...
Their need for routine.
Why else would I need to explain 15 minutes explaining why Mickey Mouse Clubhouse was not on today at it's usual time? Apparently my 3 1/2 year old knows your schedule better than you do. Which is impressive, considering just as we figure out the latest schedule, you decide to change it.
And while I'm at it, while I understand that a large percentage of the under-5 crowd consists of early risers, my child is miraculously not one of them. Which means I would appreciate it if Playhouse Disney wouldn't end less than an hour after my child gets up, leaving us with nothing but Phineas & Ferb (which is hysterical, but my child is not yet sophisticated enough to appreciate the humor) and the various non-cartoon shows which I can not yet tell apart but are clearly geared more towards the Tween set. Which, I might at, should be AT SCHOOL.
Seriously, a consistent schedule for the preschool set - look into it.