They will lose money on health care, which is the biggest part of their money. Which, in turn, will raise the rates on all other aspects of their company. This includes homeowners insurance, car insurance, etc... My girlfriend just got a "rate hike" from gieco just because they could do it. 30$ more a month for nothing. It's because they lost out on a lot of money from their other endeavors so they have to make it up. Insurance companies are absolutely crap. They will always get their money. No matter what legislation you pass, they will come up with whatever BS reason to raise the rates. They will make up the money back somehow with fee's.
The banks do it everyday.