Aside from Rosen shocking everyone, and from this point playing like a franchise QB, Miami is taking a QB with their highest pick in 2020.
Though Tua to this point is undoubtly the QB to take, that does not mean if Miami were not to get Tua, that all is a failure.
Though Tua is the best option coming out of college, there will be a handful of college QBs that each could be successful in the NFL.
In 84, Marino was coming out from not as good season in College, and with a drug rumor, but he turned out pretty well I think.
Tom Brady was thought of at best a quality backup, but nobody expected much from him...mistake.
Drew Brees looked like a nice QB, could help a team, but not expected to be special...so much for that.
Brett Farve was a nice QB that could develop into a quality QB, but he was more the just a quality QB.
Aaron Rogers though at the time considered the top QB coming out, because of his size, nobody other the Greenbay thought enough of him to pick him...fail.
In 2012 the class of the QBs was Robert Griffin III, and Andrew Luck, but nobody other then Seattle thought much of Russell Wilson... All teams that year now wish they had taken Wilson.
Many people are in love with Tua potential in the NFL (Heck, I am in love with the idea of Tua in Miami Colors), but that that does not mean in 2020, Tua is the be all, end all of the QB class...there is more then one option out there.