I agree. A consumption tax is not a good idea. Besides it completely hamstringing the lower and lower middle class it also stifles consumption on the higher end.
Consumption taxes would devestste small and start up businesses. Sure you can continue with tax exempt status but let's simplify things and tax exempt status alone would not protect small start up businesses from taxes if we switched over to a consumption based system.
Consumption taxation extends the purchasing decision of pretty much everything. Our economy depends on consumerism and consumption in 2012. Such a change would be fatal even if it did make people feel good about getting illegals to pay more taxes.