I strongly suspect that the C-Series / A317(?) is to Airbus what the MD-80 / B717 was to Boeing...
It will be kept going for a few years for primarily political reasons, allowed to wither on the vine, then will be quietly consigned to the aeronautical dustbin of history. Bit like the Dassault Mercure too.
Pity as it's a nice aircraft, but there you go.