It is also clear a majority of people want a certain set of government services which require a funding base. All sides will never agree which means public policy will forever jump between opposing positions. We can't end this deadly dance as this is how our government is constructed, but we can set limits guaranteeing our income rights as citizens of the United States. The constitution's primary purpose is to establish strict limits on government power. A consumption tax is better than an income tax.
People can still game the system.
Rich people don't pay enough taxes. The government spends too much. The government spends money on things I don't like. Let's be clear, the purpose of this amendment is not to solve all tax problems, its purpose is to set limits, much like other parts of the constitution set limits on the government without specifying exact details. Once limits are set there is a lot of room to make policy changes, debate sides, etc.