I would seriously doubt that Lockheed will re-enter the commercial aircraft market. The L-1011 was less than a dazzling success. It also created a tremendous drain on their resources.
Contrary to what was said in Reply 1, there is still an opening for a company to build RJ
's here in the good old USA. Boeing is assisting with the development of the RRJ. Their domestic operations are focused primarily on the 7E7. If Lockheed were able to negotiate a deal with the Chinese company that bought the prototype and plans for the Fairchild-Dornier 728 family, they could have an impact on the market much sooner than if they were to develop one from scratch.
But, as I began, I still doubt that L/M will return to building commercial aircraft. They have a nice niche in military planes. Stick with what you know best.