While it may delay AES, perhaps it will also provide a chance to "re-work" the program. I love it, but there are many different capabilities now that FSX is coming in to play. I must admit, the only aspect of AES that I feel I use now are pushback and to some small extent the service vehicles (which I rarely see since I'm in the cockpit pushing buttons). A rework to accomadate FSX native jetway animations (hopefully to be improved upon), native pushback tugs with new models/textures and such could really put AES back to the top of a must have list for FSX. Perhaps even options for the fuel truck to actually refuel, etc.
Since it has been out for 6 or 7 years now, I still have yet to try AES. I know a lot of people swear by it, but frankly there seem to be a lot of things about it, that aside from using when taking screen shots, dont seem like things I would use.
I am not so sure I would use the follow me car. In fact do many airports even use follow me cars anymore? The service vehicles would be cool looking for screen shots, but if you stay in the cockpit you wont even see them. If I ever try AES I think the only thing that would be useful would be the marshallers and push back, then again FSX already includes push back tugs.
It seems like AES is probably better suited for FS9 use than for FSX, but since they have a free file to make GibraltarX work for free I will still probably give it a shot one of these days and see how I like it.