The 18th Amendment (Prohibition) and the 21st Amendment provide an example of how the process is supposed to work. Prohibition was ratified by enough states to be added to the Constitution. (Kansas, home of Carrie Nation, was the 28th State to ratify, although it was the first state to prohibit alcohol consumption in its state constitution.)
When the nation decided that Prohbition had been a mistake, the 21st Amendment was ratified, thereby repealing the 18th. (Kansas never did ratify the 21st Amendment!)
Today perhaps, the Court might simply have found in some penumbra of the constitution a prohibition on liquor, thereby skirting the whole process, and might later have found a right to liquor in another clause or penumbra.