I also think that people making commitments to love one another through their whole lives (and I don't just mean marriage, but any commitment, public or private, legal or not) regardless of the whims of their emotions is a good thing

I comletely agree, but the important part there is any committment. What I don't think is that encouraging people to make that committment for the wrong reasons is going to improve society.

People stop being in love with each other the whole time -- but that doesn't mean you have to stop loving someone, because I think that to love someone is an act of care and unselfish nurturing that transcends feelings.

I'm not sure I understand this. I would agree that you can remain close friends after you stop loving someone and have a platonic bond and also that you can, in that state, decide to continue to live together in order to bring up shared children but I think perhaps we're using the word love for slightly different concepts here.

maybe encouraging more people to commit, in some form, might make for less disturbed and feral children

Not if the only reason they commit is because they're going to get more money. That's not going to help their relationship last any longer or improve it's quality.