"The US has a rich history of adding and abolishing amendments."

Really Donuel? Here is a brief summary of that "rich history" from 1789 to 2014:

11,539 proposed amendments have been introduced of which only 33 got anywhere. Of those 33 proposed amendments 27 have been ratified by the requisite number of states (But as two of these cancel one another out that only makes 25 amendments that are in force), 4 proposed amendments are technically open and still pending, one is closed and has failed by its own terms, and one is closed and has failed by the terms of the resolution proposing it. So in 225 years out of 11,539 amendments you've managed to pass 25 of them, or 0.23% of all those proposed - A rich history indeed - One of almost complete and utter inaction.