Although I prefer to not see a new plane on property..
And
Personally
Don't want to or plan to leave the bus... I think if it's a too good of a deal they might decide to go that route. Airbus is pretty back logged with orders. Could they deliver another 100 in next 8 years? Maybe but just take a look at their outstanding orders. Maybe not.
Bombardier has one big suitor (delta). My guess is bombardier would basically seel them to us at
Cost along with some free sim time and maintenance parts for a period of time to get the publicity and ink another large order. Not to mention they can deliver them much quicker. (Assuming). Bringing another type on property would have headaches but if the cost benefit analysis shows that they are 1/3 the price of the Airbus I think they would seriously consider it... And they prolly have