They didn't get pushed out by Boeing. Boeing launched the successful widebody 747. The LM and MD both launched wide-body tri-jets. Airbus launch widebody 2-engi

They didn't get pushed out by Boeing. Boeing launched the successful widebody 747. The LM and MD both launched wide-body tri-jets. Airbus launch widebody 2-engine jet. But the market simply was only big enough for one of each. So LM and MD basically competed. MD having a more established costumer base, lower prices and being first to market won against the more fancy LM jet. So really its more accurate to say that MD killed LM. But really it fucked both companies over, widebody tri-jets just weren't a big enough category. LM engineering was mostly on point. They should have just build a twin-jet instead. The problem is, a single project is so expensive it might take the company down. LM made a bet, lost and it almost destroyed the company. So they didn't want to bet again.