Slight thread drift...
I tend to think that many passengers who could afford to fly in premium cabins choose not to do so when they themselves and not their employers have to pay because, unlike other aspects of their consumption (e.g., cars), it is less easy for these insecure people to show off to others how much money they have (ergo, how important they are) by doing so.
But to come back to the question, whilst I'm happy to fly short-haul in economy, I would not fly in the same cabin long-haul under any circumstances, even if seat pitch were increased. That's my view, although others will doubtless disagree!