Another important point to note is that when Emirates commenced DXB-NCL in 2007, they did so using the A332 (237 seats). It took five years for Emirates to generate enough demand to be able to sustainably operate the much larger B77W (360 seats). BFS doesn't have that luxury, given that Emirates have since retired their A332 fleet. In order for Emirates to launch DXB-BFS, they would need to be confident that the route could generate at least 200,000 passengers annually (out of 262,800 available seats - approx 77% LF) within the first couple of years of operation.
That is why out of the ME3, Qatar Airways have been the most vocal about a potential BFS route, given that they operate the much smaller B788 (254 seats). In addition, Emirates' B77W has 10 First and 42 Business Class seats, compared with just 22 Business Class seats onboard the Qatar Airways B788. A potential BFS route would likely be unable to fill just 22 J seats, never mind 52 F/J seats, making Emirates even less likely to operate DXB-BFS.
Qatar Airways haven't yet ruled out BFS, and have already launched routes to smaller airports such as CWL, so it is likely that DOH-BFS will be the airport's best bet. However, I doubt that such a route would be in operation until after 2020.