[quote]
Would it be technically feasible to make such an aircraft or it would be too long? Also I feel the combination A321/320 seems more attractive than the product line you describe.[/QUOTE
Naively, Bombardier hoped to escape a major reaction from Airbus and Boeing by limiting the C Series to 130 two class seats but A and B responded anyway with the neo and MAX. Many, many carriers told them that they needed 150 two class seats and, given how much larger the 150 seat+ market is than the 100 seat+, Bombardier would have picked up at least a part of this market with a CS500: it would have been the only all new offering in the space with new technology airframe and systems as well as engines. Why design an all-new 5 abreast cross-section cabin which they admit could easily be stretched and then limit it to 130 two class seats? When was the last successful narrowbody with only two variants (oh, all right - apart from the 757)?
Could have made a real dent in A's and B's market but, sadly, unlikely to happen now unless a well-heeled investor steps in: COMAC?