On the frequent flyer site flyertalk.com, there's a lot of discussion about this issue. My own suggestion is to reconfigure the seating arrangement so that seats in economy are not in straight rows, but slanted a bit so that my shoulder is not against the adjacent pax's shoulder, but next to that pax's thighs, for example. Thus, and this is exagerated because of the line spacing, the seats would not be [A B C D E F] but more like
[A D ] B E C F
A comment was that the plane might lose a row of seats, but my response is that this matters only if the flight were 100% full. Plus, only a section of the plane need to be configured with this arrangement, with a slight pricing premium charged to sit in this section.
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