Thanks Just A Spotter,
Completely, Cityjet's experiment with the Sukhoi failed sadly. However, this does not mean that the we won't see the MC21 appearing in Europe, if the Russian's want to make this new entity work they will need to get their support services into order. I wouldn't discount the new type.
On the Cityjet topic the main driver for the withdrawal of the type was the experience that Brussels Airlines had with the type and their subsequent rejection of the aircraft.