The 17th Amendment destroyed vertical separation of powers, along with the States' check on the wild whims of the people's House. The Senate of the States was replaced with an additional body totally dependent on the people, only worse. Elected Senators have six year terms, which our Framers would regard as an outrage, dangerous to liberty, AND serve a duplicative, unnecessary purpose.
Restoration of our liberties is impossible until the 17th is repealed.
I agree that repeal of the 17th amendment would be a step in the right direction. However, I don't think it is the deal breaker you suggest.
Another amendment is the only way to repeal any amendment. Therefore gaining a constitutional government would seem the first step toward repealing the 17th amendment.