> it stands to reason some of those would have opened up and we may have been able to sit together.
I'm curious what your reasoning is? That experience sounds like it sucked, I've had similar and I can sympathize, but I might guess that your anger is misplaced. The comment you replied to is someone traveling in a pair. People traveling in pairs and shifting from a window/aisle to a middle only vacates 1 seat in a 3-seats-per-side 727 type plane, so that strategy doesn't affect you. If a plane is entirely full of pairs, no shifting for people to sit together will let you and your wife sit together. You could possibly sit across the aisle from each other if you find two pairs, which you can sometimes do with some talking to passengers and/or agents.
It's far more likely that the plane was mostly full of singles and not pairs, and asking someone to move to a middle for you is a downgrade for them. I've done it successfully before by asking a few people nearby who'd be willing to move in exchange for me buying them a drink on the flight. But, most people are quite understandably reluctant to move to a middle when they're in a window or aisle with an empty middle next to them.
Ultimately though, no amount of communication or behavior or game theory would be better than if the airlines would just make the seats more reasonably sized -- just a couple inches in each direction. But of course, if they do that, we pay more. :P