I don’t know if anyone here is seeing Ronaldo play for Manchester United, because he’s missed some really easy goal scoring opportunities, and had it been any other player then he would have been warming the bench for those kind of performances, therefore I doubt that we can see him at the next World Cup.
Also key for Portugal will be Fernandes as he can master a win for them, but then again @Sithara007 is right we should wait till the match is over to discuss about this.
But therein lies the difference between a great player and others. You only talk about the failures he had in good opportunities, because he is Cristino Ronaldo. Everyone is waiting for him to score all the time, but that's not always the case. He's had moments like this before, but he got over it faster because he had a team that helped, which is not the case with Man United.
He might miss some opportunities, but he's there. If he wasn't there, would another player be there to take the opportunity? Maybe not. One thing is for sure, looking at Ronaldo, I continued to see an integration in the game and a search to help the team, which I don't see in other players, and that is very important.
As a Portuguese, I can say that I don't think Portugal will qualify, not for lack of good players, but for lack of the right attitude on the field and the poorly assembled strategies on the part of the technical team. Now if Portugal is capable? Yes it is, overall I think they even have a better squad than Italy, but tactically they are very weak. If your attitude changes, then yes, we can see the best of Portugal.