Given recent political issues it's unclear if they will add flights to/from DXB for the WC, but it only makes sense that they should do so. With hotel supply in Doha expected to be so limited, flying people in and out may be the best way to fill those stadiums. But that would probably require more scheduled flights from neighboring countries.

For now, I booked via AUH instead. There are more flights, and they are generally cheaper than DXB. The one-way AUH-DOH is still relatively expensive, but I was able to get award tickets on Etihad (transferring Amex points to Etihad miles). By contrast, the return flight DOH-AUH is relatively cheap at the moment on Etihad (< $150), so we booked that with cash. Still, I would prefer to fly back via DXB to make my connection home on Emirates easier, so will keep watching for cheaper flights via DXB to open up. Maybe Emirates will add the route -- we'll see.