I noticed RCV fundamentally violates the 'one man, one vote' principle whereas voters who picked a losing candidate get a second vote in deciding the winner but those who select better performing candidates do not have their second vote candidate as their choice is not eliminated. Should and/or will RCV be declared unconstitutional?
You noticed incorrectly. In ranked-choice voting, each voter casts a single vote. This vote is
transferrable, but voters do not "get a second vote." Only one vote per voter can be counted in each round, and each voter's vote counts only as a single vote.