I enjoy T20. But it's simple fun. Like a comic book. And a comic book isn't better than a good novel...
It sounds good in principal, have a T20 competition, get a lot of new nations, slowly get them into FC cricket. But how is it practically possible? A team like China or USA comes into a T20 comp, and does well, fine. But then how do we get them to play FC and Tests?
I say a minnow T20 Championship, broadcasted in all the nations taking part, with plenty of glitz and glamour. Get celebrities of those nations involved, lots of advertising, big prize money, attract large crowds.
Keep that going for a bit so that they get interested in actual FC and OD games involving their country, and then get them to play some ODIs and FCs against teams of equal/better skill. Then the Intercontinental Cup, then the Champions Trophy and the WC.
But is that practically possible?