A better term is sewer tube not cigar tube.
Folks are getting fatter, much fatter, and that fact is being ignored by the FAA and the airlines except maybe for consideration of weight and balance issues. There should be an area where first class sized seats are positioned for folks who are simply too big to fit in a regular seat and who occupy parts of adjacent ones. And they should charge more for them and require that those over a certain weight - say 275 lbs must pay extra and sit there instead of punishing all the other normal sized passengers. The airlines are not going to fix any of this. It has to be by FAA regulation. The seats will be a minimum of X distance apart, recline a minimum of Y, and anyone who weighs more that Z shall occupy and pay for larger seats. Period. If the airlines all have to do it then the market will dictate the cost and value. The current situation is out of control and not sustainable. And some people wonder why passengers are more unwieldy and abusive than they used to be. How about a little cause and effect analysis.