Nowhere in the founding documents of this country is the word "democracy", or any of its derivatives, used. Our form of government is a Constitutional Republic, based on the Rule of Law, not the whims of the majority with the rights of all protected and gauranteed by the Bill of Rights. Rights which arebestowed on usby God, not given to us by government.
A National Referendum Amendment would nullify the Constitution as the authorities and responsibilities of each of the three branches of government as defined in the Constitution be superceded by said Amendment. In fact, under color of that Amendment, a mere majority could repeal it and impose any kind of government they so desired. With the country pretty much evenly divided between Republicans and Democrats, wich ever one could win a mojority could rule the country indefinitely. It would allow the majority to impose its will on the minority. There would be no protections for your rights as the Bill of Rights would virtually cease to exist. Majority Rules - Forever!
National Referendum Amendment - A Bad Idea!