Well, to be realistic, I actually doubt the the Boeing focus will change soon, which isn't a downside of course if they go on with the interesting 777 or the very classy 737-100/200 line.

To get the Airbus stuff in to the sim you can't just take what you have developed before and refine it to get a new plane out of it, so one has to ask if a new detailed release can be sold enough and also fits into the development costs corridor then.
However, the A310 is open to be in the sim in detail and while other devs are doing the A320 range, maybe someone else could go for a nice A330 or so.
When picking a modern Airbus, the workload on the systems will surely increase. But NaMcO is right, if you e. g. have the MCDU and the whole AP modes modelled, the variants from A320 to A340 can share a large code basis.

The A380 is announced by another dev and they've stated that they are still on it.
There are some more or less detailed A330/340s available, but they are from 2006 or so (or older) and didn't improve much in the meantime.
For me, there's a big, big Airbus gap in the sim concerning ones which are up to 2010/11 standards.

But you can get a detailed A300 so far, a classic gauge variant with big attention to details and systems. They've also announced that they will model the FMC version of it in a medium-term plan.