Reclining Seats could disappear from airplanes soon. Apparently airlines are looking at the cost of the reclining seat. The part that is used to recline requires a lot of maintenance and has weight (costing more fuel). Also the arguments of passengers costs time.
Personally, I wouldn't mind if they got rid of the reclining seat on airplanes....never been a big fan of someone in front of me leaning all the way back so they're head is in my lap.