Medicare exposes the faults in the US for profit healthcare costs, that's why so many on the right oppose it. neo-liberalism also calls for the reduction of entitlements by the government. basically anything that the government can supply should be "privatized" so it can be turned over to for-profit company's to further bleed the working class.
If you read the OECD Guildlines for Multinational Corporations, it states that they need only abide by the laws and standards, etc. provided by the country's that they operate in. the less the government provides for it's citizens the less the MNE/TNE has to provide to it's employee's. Once the radical right gets rid of medicare so will all US company's for it's employee's.