That should go over like a lead balloon.
Personally, I would love it, since I make most of my purchases outside the US and as such not be liable for any income tax.
Poor people who spend 100% of their income would pay 30% on 100% of their income
where rich people who consume a much smaller percentage of their income, will pay 30% on a much smaller percentage of their income. In fact many of them would pay close to Zero percent of their income if they are smart and make many of their purchases outside the country.
Brilliant!!