Icon,.... seriously dude I am rather offended by you constantly saying that one partner is keeping the other childless.... don't you get it...that the person who is not able to procreate is not doing so by choice, it is Allah's will that they can't have kids.
And if any husband is happy with a wife who can't have kids or if a wife is happy with a husband who can't have kids, why is it so wrong??? I mean is your purpose as a wife only to give your husband kids.... in that way the men in Saudi Arabia must be the happiest of the whole lot...their women seem to procreate an awful lot....
Our Holy Prophet SAW didn't have any surviving kids with any of his wives except Hazrat Khadija(ra), did He marry to have more kids... did He taunt his wives.... did they feel low and worthless and dejected coz they didn't or couldn't have kids....
May be you need to answer harder questions rather than going on with the rant. Read it again:
If there is a female who wants to have kids and happens to marry a person who cannot procreate, should she be forced to live the rest of her life with that guy? If she still willingly decides to continue her marriage for her own free will then its her choice but if she does not, can she be forced?
If a couple are happy in any circumstances then thats the best thing. But if someone does desperately want to have kids then he is allowed to marry again. In such circumstances i feel its worng for the wife to seek divorce if her husband marries again.