So what. The loss isn't what you think it is at all. Their absence will make it much easier for other manufactures to step in and fill the void. Americans will be better off not having to deal with their BS. Their quality has gone to the dogs over the last 20yrs.
As for buying big planes, LM can and would do it. Others will step in, don't be shocked when Musk starts a plane business. He's talked about it for quite awhile