Will there be anything left of Boeing -- that's worth investing in -- by the time this strike ends?Boeing's labor strike entered its sixth week on Friday. With 33,000 workers from the International Association of Machinists (IAM) off the job and on the picket lines, Boeing (BA -0.20%) production of 737, 767, and 777 airliners is shut down and, according to even the most conservative estimates, Boeing is losing $1 billion a month as the strike drags on. (Other estimates rise as high as$1 billion a week.)Wit ...