While Boeing may be too important to the U.S. for the U.S. government to let it fail, it will need to resume sales in places like Canada, the E.U., Japan, etc. etc. I think it is safe to say that their overseas sales are in jeapardy. Almost half of Boeing's sales are non-U.S.: https://www.statista.com/statistics/680130/revenue-of-boeing...

Note that this is FY2019, after losing 737MAX sales. If they are without a direct competitor to the Airbus A320 for years, it will be a big hit, not least because several Boeing-only airlines will be forced to start buying Airbus.