May be, and are.
Divide and conquer is the strategy for tax increases, gun control, and ultimately, people control.
The hardest tax to increase is the one that hits everyone the same. If the tax rates are different for different income levels, then it is easy to demagogue and attack one group at the expense of the others. What you will see, IMNSHO, is continued downward pressure on the sales tax rate as people see how costly government spending really is.
Can someone post some news stories of consumers having their homes confiscated for failure to pay sales tax on a purchase? If a sales tax is the easiest way for the government to confiscate property, with almost every state having a sales tax, then it would seem that property confiscation due to failure to comply with the sales tax would be a regular occurance.