MAN777
I'm not saying (and hope Qatar wont) lose out to Emirates.
What I believe is that Qatars options for expansion are limited by the behemoth local competition that is Emirates. (Same goes for Etihad as well)
I'm convinced with their excellent service they can maintain a daily service - just unsure as to whether they can grow any further.
As an aside, many tour operators are now automatically booking their ex:MAN package holiday clients to Dubai via Qatar airways. Obviously this is not for convenience, it's on cost. When Emirates add significant extra capacity (and hence have plenty of spare seats to dump onto the market) these bookings will just vanish for Qatar.