The Golden Age of flying is over
The budget airlines already do London <-> Tel Aviv in standard single aisle planes and it's not fun because they are the same planes kitted out to do 90 minute journeys. The personal space is non-existent, with so much crammed under seats you can't stretch out properly.
I do wonder how much of this is the airlines trying to make a profit compared to the tax imposed by governments. Seems that every time the airlines get some wriggle room, the tax authorities steal that profit back with a higher APT.
Personally, I simply wouldn't fly long haul on a single aisle plane. I'd rather not go and save my money for a better quality flight.