Very simple - fast food corp is profitable because most of its franchises independently operated or not make money. They make money because labor+fixed costs+materials are less than goods they sell. If you increase labor cost, you also increase cost of goods. Even if you make a suggestion that they cannot pass these costs (because they are competing with burgers from China?) to consumer, you still make one HUGE assumption that extra labor costs are significant enough that it will take it from profitable to unprofitable. There is nothing that supports such assumption - healthcare costs are not going to be significant, worst case scenario is burger going to cost 5c more so employees get coverage. All this teeth gnashing is nothing but FUD. Corps not going to go bankrupt providing health coverage or livable wage, worst case scenario is that they going to get marginally less profitable and taxpayers stop being on the hook subsidizing their labor costs via welfare.

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