The acquisition of Bombardier C-Series (rebranded as A220) program positions Airbus very strongly against Boeing for long-term future in the narrow-body space.
A220 is an extremely efficient and flexible platform, easily stretched to compete directly with today's top-selling narrow-body airplanes, A320neo and B737 Max.
I believe A220 will substantially replace both B737 Max and A320neo as the top narrow-body workhorse within the next 2 decades. Boeing does not have a competing platform (yet).
Boeing has been left quite a bit behind in the narrow-body space and would need to push hard (and need a lot of cash) to be able to catch up.