May as well throw in my two cent's worth, since I paid for the privilege.
When I see someone ask about plans for ATC, real world weather, AI traffic and such stuff, and the reply is "we're working on it or will be working on it", my reaction is this: Please don't work on it too hard. None of the current "big" sims (FSX, P3D, X-Plane) has anything approaching decent ATC. I've used Radar Contact, Proflight, and now ProATC-X, and would hate to go back to using something on the level of the stock FSX ATC. And none of the sims has anything remotely like the AI traffic you get with a payware, or even decent freeware, add on. Stock weather functions are quite a bit better than the stock ATC and stock AI traffic, but I still much prefer ASN. I also use REX worldwide textures and Orbx global textures and vectors. So what I would prefer in a new sim is that it either incorporate existing, good quality, add on ATC/AI traffic/WX, or have some arrangement with the developers of those products to be able to purchase them at a reduced cost. For example, buy the Flyinside sim and get Ultimate Traffic for 50% the usual price. Or whatver, you get the idea. If the add ons were to be incorporated into the sim, of course it would cost more, but I for one would be willing to pay more to get them. If you want the best, you end up paying for it one way or the other. This way the Flyinside team would be able to concentrate on core functions.
I'd be interested to hear what others think of this approach.