By that you probably mean World cup or Copa America. From what i've learnt over the years is that in Europe, the copa america isn't really held in the same regard as the Euro's (obviously). If Messi wants that particular narrow minded recognition, i.e. you can only be the best if you emulate what someone else has done, then its the world cup or nothing imo.
The problem I have with it is simple, people constantly suggest that the Argentina side with Maradonna was 'average' plus Maradonna. And then continued to say clearly Messi's not as good yet because he did nothing this world cup. Argentina in 86 conceded 5 goals over the course of the tournament, Argentina in 2010 conceded 4 in one game. Argentina need to be defensively sound (they can only dream of being as 'average' defensively as their predecessors at the moment) before that particular argument can have any bearing what so ever.
Unlike you, I can comfortably see Argentina falling short in the major tournaments, regardless of the fact they have amazing talent going forwards.