The title seems to be misleading. The article says that the provision in the Family Code for prenups is being kept. The proposed change seems to replace community property as the default with separation of property as the default. Good for the rich spouse.
IMO a fair split would be:
50/50 split of all assets accumulated during the marriage
The division of property that was separate before the marriage should be split scaled to the length of the marriage. Up to a 50/50 split if the marriage lasted 10 years or more.