While there are those that say everything Øbama has done Trump can undo, you cannot get all the toothpaste back into a tube. Trump cannot unkill folks killed due to Øbama, cannot unspend the stupid expenditures.
Similarly, undoing the 17th is somewhat getting toothpaste back into the tube. We here can agree on many rationales that the 17th is bad for the Republic, but we here also have a depth to those rationales. To get that depth to the 33/38 or so state’s COS delegations is one thing, much harder to the ratifying states, but still much harder for the underlying support needed there: To convince enough of the populace to vote for state reps and state senators that would move thru an anti-17th-amendment-amendment.
Nevertheless, there is that expression “a journey of a thousand miles begins with a single step”, and we’ve taken a few already...