This isn't talked about enough, but yes, Capcom's producers are very smart to not give up on Monster Hunter in America.
The smart money told them to stop a long time ago, that MH would never succeed in America, that it's a Japanese series with a Japanese mentality that can't find a foothold in this new, modern game industry. And 300k isn't the biggest deal in the world, they're at least at the ballgame, which very few people could have predicted five years ago.
I think one question to consider now is this - what do you do with Monster Hunter in America now? We forget that this is MH4 2nd Edition. We didn't get MH4 The First. Is this the new gameplan for America, wait for the revision and release that? Or release the first one, then release the revision? Is that something that will fly in the west?
It's at the ballgame, now there's a lot more questions that need to be answered about the future of the series outside of Japan.