My hubby and son are flying to Canada next week for a family reunion (hubby was Canadian.) They always pack light and hate to check luggage but just take carry on. I told them they'll just have to leave the "toiletries" at home and buy some when they get to their destination if they want to take just carry on.
This is going to create huge back-ups at the airport because not everybody will know about the notices and many people carry their toiletries with them in a carry-on.
I hope, very large warning signs will be posted at places where the passenger is only a short distance from the baggage check areas.