To be honest, any questions that peer into the future will net you the same answer: we really don't know. In this case, I'm not even sure that the Gateway team knows.
This is highly unlikely, but again, we don't know for sure. However, I do think it'd be ridiculous for Gateway to stop supporting their own cart just because there are clones in the market. Could you imagine how different the DS flashcart scene would be if every team stopped supporting their own flashcarts just because a clone hit the market? Wouldn't make much sense.