Oh I would love to see that. I think he would reach his peak of the entire season there, and give Pogacar a proper battle. Heck, Valverde did it at the same age, and was competitive in all 3, I believe Rogla can do the same...
He is 3rd best one-day rider of the peloton (with 4 big wins), one of the 2 best time trialists (probably will end up as the best) and a GT winner.
How he is not a generalist then?
Absolutely not.
Olympic and world road race champion, multiple world time trial champion + also olympic champion, Vuelta winner, double Liege winner is certainly better than double Tour de France champion, no matter how much second places he has.