The suggestion that Roglic should have rode the Tour in 2019 is always up for debate, but even if he had won it his detractors would now say, "But Pog wasn't there". Also, the landscape leading into 2019 was very different to what transpired in the race, with Froome probably an overwhelming favourite having podiumed 4 consecutive grand tours, but now fully rested again. Roglic impressed in 2018, but Dumoulin and Froome had come off podiums at the Giro, and still defeated him. Those guys would have been seen as a level above him. In addition to that, Roglic was still learning to time his peak, and in the 2019 Giro he came in a little too hot (though he crashed which also didn't help); who is to say that he wouldn't have made that same mistake at that Tour.
I don't like to compare Roglic to Evans, but his Tour dream is not over yet. Remember Cadel's chaotic Tours of 2009 and 2010? Ringing a bell with Primoz in 2021 and 2022. Roglic winning the Tour in 2023 is not too far fetched, and could see similarities to Evans in 2011. Perhaps Pogacar will race the Giro (like Contador did). Maybe Roglic could go to another team. Why not, eh?