I think it’s been long over due.
We need the ability to have some kind of a Career-Mode like in ETS with different tasks at hand and from different HUBs. This could be implemented with different pre-made scenarios as well as customizable/random scenarios for when flying offline, in multiplayer sessions and through different networks like IVAO/VATSIM.
The premade scenarios could be flying tourists over cities for VFR sightseeing tours or bush flying etc. like some of the missions we had in FSX. The POI should then be able to be tweaked/randomized.
Like the current landing challenges in the sim, one could earn points for the punctuality of the flight, the service of different requests (such as a passenger requesting to see “The Shard” in London or similar mid flight), turbulence/bad weather avoidance, overall comfort (incl. t/o roll and landing), fuel costs (by tweaking fuel level according to the weight and weather) and so on.
This adds to cargo flights as well, and also regular passenger flights/business flights, coastal flights, ferry flights etc.
It’s a world of opportunity to broaden the sim further.
Other than that, having the ability to see the passengers (with RANDOM, CUSTOM, WEIGHT PLEASE!) boarding the plane and possibly them actually sitting in the plane, taking pictures or similar, would be epic.