I won't buy it if:
*You can't get free addons from the community developers like you always could
*M$ has control on add-ons
*It is more a game than a simulator even with sliders maxed.
I WILL buy it if:
*You can download free addons regularly on sites like this and other community Flight sites
*It can behave like a real aircraft
*It can have realistic Google Earth style scenery so that my flights can replicate real flights
*I don't have to keep spending money to get more addons.
The enthusiasts for home flight simulation are out there. I am not sure MS Flight will meet their needs. I would not be hopeful about a small addon company like aerosoft having the resources (which is $millions) to develop a good alternative.
There is still some hope that other sims from $billion companies may rise to meet our needs. - Or the community can develop ourselves 'Flightgear' - which can be as good as FSX if it was developed.
Well. I guess you ain't buying it.