You captured my thoughts on this.Flying is miserable enough without enduring some stankin' ass passenger for hours in a tightly confined space. I have absolutely no trouble with hygiene and it shouldn't be too much to expect other people to make these minimal efforts. So good, if you smell, damn right you should be asked to get off the plane. This should include people who think it's ok to douse themselves in perfume/cologne. It's just rude.
I can't image sitting next to someone that reeks from Tokyo to the US -- especially a flight to the East coast.