I'm not a huge fan of alimony/palimony myself. Having said that - obviously any man or women, married or not, has an obligation to provide for children that they have produced.
There are few ways that I could see non-legal spouses being entitled to money/compensation - such as there is a pre-nup agreement (or its equivalent) in place, otherwise I see it as the non-working spouses responsibility to make sure that their future financial needs are addressed. For instance, s/he could require that a certain percentage of the household income be directed into an account in his/her name during the course of their relationship as compensation for the "stay at home" duties they assume - it would then be his/her call as to what to do with this money (spend it or save it).
Nobody likes to consider what happens if a relationship dissolves - but if people make assumptions (i.e. "he will take care of me for the rest of my life") then THEY are responsible for the consequences of those assumptions should they prove false. We are all adults - we are all responsible for our own actions. Failing to take action is a decision in itself.
Me: poly bi female, in an "open-but-not-looking" Vee-plus with -
MrS: hetero polyflexible male, live-in husband (23+ yrs)
Dude: hetero poly male, live-in boyfriend (4+ yrs) and MrS's best friend
Lotus: poly bi married female, "it's complicated" relationships with Dude/JaneQ/MrS (1+ years)
+ "others" = FBs, FWBs, lover-friends, platonic G/BFs, boytoys, etc.
My poly blogs here:
The Journey of JaneQSmythe
The Notebook of JaneQSmythe