Do you know what tournaments he is playing? I guess it depends partly on that. Obviously all top players have bigger chances when fewer of the other top players are involved.
That said, I think he would prefer to get big results, SF, F etc in big tournaments rather than win a MM.
The poll is, will he win another title, not grand slam. There are two Masters Series and a year End Masters Cup.
I'm sure he wouldn't mind winning an International Series, maybe Vienna, that is an International Series gold, he played there last year and lost to Gonzalez.