Opening doors isn’t fun. School busses would be un workable with that back door if it was.

You can't open the emergency doors while the cabin pressure is higher than outside pressure, if that's what you're worried about. And I think they don't let kids sit at the emergency exit either, because the person sitting there needs to be physically capable to remove the door, which has some weight to it.

No, this is backwards. Fun is trying new things (I think it's evolutionary mechanism that ensure kids are learning by default), and once the thing has been tried, it's not new anymore, so won't be tried again. Best thing we can actually do is to channel that, as OP proposed.

If only we had cheap, multi-use inflatable exit ramps that deflate, fold and stow themselves after use. Which is not a thing, apparently.

But what if it improves everyone’s safety?