Even though the World T20 is`nt the biggest International cricket tournament like the ICC Cricket World Cup, it still is the biggest T20 international tournament and also the one which actually matters in terms of T20Is (T20s hardly have anything of substance internationally). With T20s being very fickle as such, I would`nt want someone to win a world title in the format on the back of a couple of freak performances. The current format is perfect. Teams have to play 7 games and win most of them to win the cup, which gives you a sense of satisfaction unlike a one-off game.