Until he does, there is all reason to believe he never will, for me personally.
Now of course it's just too easy to only believe someone can win a slam when he has just won one

And physically... That counts for every player. Murray doesn't play any doubles at slams I think? Here he played 2 mixed doubles matches on saturday.
But yes, the difference in opinion is about the importance of the Olympics. Now if neither is willing to change their opinion, than discussing it is pretty pointless. If people have there opinion, but are willing to change it due to arguments given by people with other opinions, then it's fun

But I believe we won't really see any new arguments entering the stage

Oh wait, about his playing style. He is indeed playing more aggressive. Wouldn't that lead to quicker matches for him? Shorter rallies, not giving the opponent the chance to get into the match and such..