Well, IMO taking taxes that are currently invisible and making them visible will help curb gov't spending.
That the previously hidden taxes become visible would be sufficient to make a difference - that the taxes are lumped into a single amount instead of income tax here, business taxes there, payroll over there etc will also help invididuals perceive the cost of government.
But the most important change is that these taxes will have to leave your pocket in cash - and will represent a significant portion of your outlay on a daily basis... 23% of total spending on non-discretionary consumption of goods and services.
That'd be $6 dollars added onto a jumbo pak of huggies diapers to pay for government, $1.50 onto a six pak to pay for government, $150 onto a new easy chair to pay for government... and this is paid in cash, right out of your wallet! Damn right there will be downward pressure on taxes.
non-discretionary = discretionary.... arghhh