A short post; I want to expand on this later, but these were my thoughts over lunch and I wanted to get them up.
Don't make it simpler, make it deeper.
People rise to your expectations.
The problem is empty, meaningless ritual; congregants are unattached to it. Create the connection, and they become active.
The Seder plate: the actual food item isn't nearly as important as pointing at it, asking "What's this?", and explaining why it's there. Dark chocolate could stand in for horseradish as the marror as long as you explain that we eat it so the bitterness reminds us of slavery's harshness. Ok, maybe chocolate won't work. Baker's chocolate might.