In SC2, the mappool remains mostly static. I've heard that the Warcraft III mappool has literally never changed from day 1. Well now I guess I know what they feel like. Currently, not only are the maps BAD, but they're boring to play because they're the only maps we can to play.
I would obviously prefer some Korean mapmakers or even better, the iCCup mappers to be able to get their maps in the circuit. In the end, every mapper's goal, including myself, wants his/her map to be played in the competitive circuit. For foreign Brood War mappers, this was pretty impossible. You can find hundreds of great maps on a site like broodwarmaps.net, but you'll never see any made by a user, played on the pro level. Even if the map was made an iCCup map, no one played it because no pros played on them.
Nonetheless, I wouldn't mind too much if Blizzard used their own maps. Ok, actually, I would mind a lot. But it's still better than keeping a static map pool like it is right now. Strategies are so static and boring to use over and over again. There's no diversity. Because the game is so young, the strategies are still changing (some of which has to do with the balance patches, but those are finishing off I believe), but it'll settle down soon enough. Only with new maps does everything keep fresh.
For an example, a lot of people HATE playing on Python in SC1. It's been in use for so long and people still make games on it, but a number of people avoid it altogether if possible. The map itself is amazing, but a million games on the same map will get dull.
There are two problems with the current system. One, Blizzard doesn't change their mappool. Two, the only way to get consistent practice on tournament maps is the ladder. Thus, tournaments choose only the ladder maps when deciding the mappools, since pros will rage at the tournament organizers if they do not. There's a few tiny exceptions but all of the major tournaments like MLG, GSL, and all of them that are noteworthy, never use any map outside the ladder maps.
Honestly, it all comes down to Blizzard not doing the simple thing, and changing the ladder map pool. They say maps are not their concern right now and I think that's stupid. Balance is more or less done. Minor imbalances could form later, and I know they're getting a ton of features in for b.net 2.0, but in Brood War, maps were EVERYTHING. Pretty much the only thing that changed the gameplay were maps, and on ocassion, players like Bisu. Delaying a new balance change or a new feature for b.net for a day won't be much, and while I don't know much about making a game, I'm pretty sure it doesn't take that long to change the map pool.