<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Hopefully the airlines won't decide to permanently lock bathroom doors shut and just pass around bed pans to pax who need to "go."</font>
They already do bar restroom use for the last 30 minutes into DCA, and sometimes long lines form immediately after a movie on transpacific flights. For males, an empty water bottle works fine, especially if you're discrete. Women can also learn to do this.
http://www.restrooms.org/standing.html
I'd
love to see an airline make a federal case about it and hear the expert witness testimony about kidney discharge rates, bladder sizes, the effects of prostate enlargement, the consequences of bladder stretching, etc.
"Self help" goes a long way in solving life's problems, from changing your baby on an adjacent seat, to peeing in a bottle, to always washing your hands and using the paper towel to open the airliner restroom door.
Whatever the "policy," deal with it!