I've deferred my next visit to the UK in the hope that the carry-on restrictions are somehow changed. I do roughly one day-trip per month to London with a laptop and an expensive camera. No way can I let either travel in checked bagage. With online checkin it had gotten so easy to do a day trip. Now I'd need to queue to check in and wait for baggage at the other end - hopefully undamaged & unstolen! It makes my day trips less feasible. Overnight stays will add to my cost and visiting the UK will become unviable financially.
Not sure what I'll do if the restrictions don't change.