Deliveries of the COMAC C919 are expected to start in 2021, a lot sooner then Boeing could have an all new MAX replacement ready. I wonder how many airlines are quietly talking to the Chinese just incase.
Nothing official yet but if the C919 proves a success, Airbus are backed up with orders and Boeing can't offer a credible alternative, then they might be interested.
There could be a major structural adjustment in the aerospace market with Boeing relegated to third place.