I think we are doing a bunch of overreacting. Duke landed potential one and dones, but to say Duke was a one and done team this season is completely false. Tatum was the only freshman that played a significant role. Outside of Tatum, Duke was led by 2 seniors, a junior, and a sophomore with plenty of experience.
If you look at the final four teams, more went into them getting there than having 3/4 year players. All of them have gotten good guard play. Felder for SC is a freshman PG, but has really been a difference maker down the stretch for them. Oregon has multiple guards, but Dorsey has been on fire for them. Williams -Goss and Berry have been steady all season.
All of the teams in the final 4 rank in the top 25 defensively, which Duke didn't do all year. SC and Gonzaga rank 1st and 2nd in team defense.
They all avoided nightmare matchups and had some luck along the way. I know SC had to play teams with better seeds, but that isn't always a definitive measure. SC shot below 30% the first half against Duke, and over 60% in the second. Those type of things are hard to measure. They had a handful of shots bounce around the rim and fall in against Duke in the second half. Gonzaga could've lost their last game, but WVU didn't even get a shot up on the last play. The Zags also benefited from the refs against Northwestern on a missed goaltending call. UNC won on a last second shot, and overcame a late game deficit to Arkansas(with some help from the refs). Oregon avoided death on a last second shot from Michigan that rimmed out.
SC has ridden a formula that has shown success in the past. They have one really, really good player in Thornwell. They play tough, rugged defense. Most importantly, they play hard and play together. SC destroyed Baylor at the Garden, and Baylor had a week to prepare. If you think Duke didn't get outworked by SC in the second round, then you didn't watch the game. For lack of a better term, they have just wanted it more than their opponents. Their play on the court supports that.
Duke suffered a similar fate in the mid/late 00's when they weren't getting any one and dones. There is no exact science to getting to a final four. The best team doesn't always win, and the most talented team doesn't either. That doesn't mean you have a better chance if you aren't the best team or the most talented team, which some of you seem to think it does.