There is nothing that will stop people reverting to learned behaviour and taking their carry on with them ... when I'm on short or long haul, I have the essentials either on my person or in a small (waist bag size) in the seat pocket or somewhere within arms reach.
- Passport/ID
- Wallet with plastic and cash
- Any medication I might need
- Mobile phone
- Boarding pass etc.
Fortunately, I've not had to make an emergency exit as yet but I am ready to reach the exit by hook or by crook.