I doubt that any thing I have from fs9 will port across into either, but if they (Microsoft) want to corner the market make a new simulator that will run flight,fsx and fs9 software and then everyone might want it
In a perfect world that would be great but in reality it's like trying to put Jalopy parts on a Ferrari. MS has the market anyway, no need to spend time on old technology, It's a business and the idea is to stay in business and not waste time or money. Spending time on old technology to satisfy a few is a waste of time and money.
Yes. If it were only a few which is not the case when it comes to developing products for FS9. If it were only a few, developers would have stopped long ago. It's because there are so many, they continue to do so. It's the extra time and work involved to do so that's the problem.
A good example of this is the fact that Microsoft still sells Windows XP. You can still choose to have XP preinstalled insted of 7/Vista.