I would love to see official tournaments on cube. Sure, there are external communities which host tournaments, but these servers are often full of more dedicated players meaning tournaments are less fun for casual players, or they have few tournaments/low capacity meaning that only a small handful of players can actually take part, or they don't host tournaments for quite a number of games. The biggest thing about official tournaments is that they will get an outreach that unofficial tournaments will never get. Sure, you can get a reasonable amount of players on an external community but, by no fault of their own, will absolutely never get the same or better turnouts than properly hosted official tournaments.
However, I don't feel like cube will be implementing this any time soon. Hosting reasonably quality tournaments would require a reasonable large amount of effort from all parts of the staff team, and I feel like it wouldn't be a high enough priority for cube to put a reasonable amount of manpower behind.