I think it will remain very difficult for Pogacar to win PR and MSR. He can but many can and other riders remain more favorite for these races than Pogacar to me. Also the tactic for UAE on MSR is something not surprising anymore.
Besides that, when years pass he gets older and new rising stars appear such as Brennan and others.
I agree though if Pogacar wants to win those classics he will have to do it rather earlier than later.
Without trying, he won't win. MVP is a challenge but sports are also about overcoming challenges. He's surely one of the top contenders in both PR and MSR and it's not a guarantee MVP will always win them.