There is a freeware addon from *****(classified) Tu-154. It's a well known to russian sim community hardcore addon. CS can produce Tu-154 really fast, if they'll make a deal with *****(classified) and make virtual cockpit for already done systems and so on.

BUT! Not sure it will be a hit. Boeing, Airbus, DC, MD much more popular in general terms.

I would like to see refreshed 727. fix some bugs, add icing effects and many other systems which present but not really functional. Some guys asked for more glass in cockpit - CS can make it as separate expansion pack. Refreshed 727 would be a major hit.