I think the man who made a song and dance on your flight was def in the wrong, he could have handled the matter in a much diff way without embarrassing the obese man or causing a scene BUT (always a but!)
If I paid the same price for my seat the last thing I want is an obese person spilling half into my seat!!!!!
I do agree that people who are too big need to pay for two seats!
I don't think it's a fair argument to say 'that's the way the world is heading the airlines should provide 'obese' seating' because we all know they are in it to make $ and if they accommodated larger seats it would mean less passengers and ultimately less $$.
I really don't know how we tackle 'the obesity crisis' as ads and info on eating healthy, exercising, lifestyle choices are all already everywhere!!! Some people just will never 'get it' and even if they are given all the info under the sun they have to want to change!!
If we accommodate them with things like large seats to me it's condoning it, wheres the motivation to lose weight if you can just book a bigger seat?