In the last 5 to 10 years everything seems to suck: product's and services quality plummeted, everything from homes to cars to food became really expensive, technology stopped to help us to be something designed to f@ck with us and our money, nobody seems to be able to hold a job anymore, everyone is broke. Life seems worse in general.
There's a reason the people who wrote the Constitution decided upon federalism as our form of government. It protects the minority from the tyranny of the majority. This concept is especially important as the urban majority seeks to assert its ignorant tyranny on the rural minority these days.
The United States isn't a single government like most non-federal nations. There is plenty of democracy in our local and state governments, and we have our bicameral Congress which accounts for both the equality of the states, no matter their populations, as well as the inequality of the states, taking into account their populations. Remove that equality and you will be unable to get enough states to ratify your new constitution.