I honestly think with Garrett we will see the same crap no matter who the QB is. Other teams rebuild quickly because the HC is creative with new schemes and plays. Landry had years of success because he changed things up and got creative. If you watch basketball you see Mark Jackson couldn't get the warriors to do anything in the playoffs but as soon as Steve Kerr took he won a championship and has gone back every year since. Their starting SF left to go to Dallas, Kerr went and got Durant to replace him. McGee leaves to go to play with LeBron, Kerr went and got Cousins.
While Romo was a very good QB he couldn't win in the playoffs. The Seattle blunder and the GB no catch, etc. HC matters and unless Garrett changes his ways Dak will end up the same way as Romo, no success in the playoffs. People want another QB but the exact same things are going to happen with that QB. Dak is good enough to win, he isn't perfect and still developing but Garrett being a former NFL QB should be ahead of the game with developing QBs and that's just not the case.
If Garrett had Aikman and Staubach I don't think he could win aa championship with them