QR has already announced that it will take no more narrow bodies, and only wide bodies from now on.
It's bizarre though that EK (and sometimes GF / QR) operate massive equipment, such as 773, on a short sector like DXB-DOH, with only a handful of pax.
I do however concede that sometimes these flights can be fairly full. I still think it would make sense for Ek to operate a small qty of A320 size equipment on such thin, regional routes.
A300Man