Just remember... Even if Microsoft don't listen (and they probably are... It's just not feasable to encorporate everything. The game engine is mostly complete) then developers somewhere else will.
One of the things that makes Flight Simulator so good is the addon community. And it's good to them to know what would sell! This subforum is for our wishes and factual news. Microsoft have their experience and they'll know what they can do, and what will have to wait for a later date.
P.S... MS, not M$