The CS500 is already a thing, it’s been in discussion for quite a while now, since 2015 actually.
@Chatta290, yes, what your saying is right, to some extent.
I’d like to highlight this paragraph from the Toronto Star Article that was posted earlier.
Credit Suisse analyst Robert Spingarn, though, said in a note that a larger “CS500” version of the C Series overlapping more directly with Boeing models will most likely be developed to “negate the need for Airbus to develop a shrunk variant of the next-generation, clean-sheet A320 replacement.”
No, Robert Spingarn is not Canadian, and has no collaboration with Bombardier, Airbus, or the Star, whatsoever.
Question: Why would Airbus need a A320 replacement?
Answer: Boeing may need to launch a 737 replacement sooner than expected now
Question: What technology will be used to fight Boeing with their NMA?
Answer: CSeries technology! Airbus will very likely use CSeries technology in their NMA to compete against Boeing.
Plus, demand of 737-8 & A320 size aircraft is extremely high.
And almost all of the designs for the CS500 would come from Bombardier, as they pretty much have a sketch for it, as they’ve been investing in the idea for quite a while.