The 737/ A320, is not feasible for our route structure. Emirates in the future will probably look at replacing the current A330's with more B777. The eventual plan seems to be B777, A340 (500 - 600 series) and the A380. Some A330's might stay on, as the minority fleet.
Listen out for their order at the Farnborough airshow.
Anyway, all of the above is from our reliable rumour network within the company, who knows what happens tomorrow.