Static passengers getting on bus but doesn't really make much sense, how do you display static people "gettin on" bus ?? Display them in a fixed position for some time then make them disappear before the bus returns ?
And. since the jetways are opaque in FSX for 99% of the airports, putting people in the jetways wouldn't work too, since you wouldn't be able to see them anyway.
Everything in GSX moves so, the very concept of static people doesn't really fit it. There will be people with less or no animations, like the vehicle drivers, but not passengers.
We WILL have full blown 3d animated passengers at some time, the engine is surely capable of it, but not in the first version.