Probably the surprising thing is how _few_ orders they have lost. My understanding is that this is because it is very very difficult for an airline to change from Boeing/Airbus to Airbus/Boeing. They need to retool their whole supply chain and retrain all their ground staff and pilots.
...but several airlines are talking about it. Notably American https://airlinerwatch.com/american-airlines-eyes-airbus-a321... and United in the US https://airlinerwatch.com/united-airlines-considers-airbus-a... are both considering replacing old Boeing planes with Airbus.