If Cityjet did move to SEN it would not last very long. They've only got AMS & DUB left with multiple daily frequencies, to shift AMS would be suicide especially up against EZY. DUB would be overkill at current frequency and really the aircraft are too big for the route anyway. Then there is the sub-contracted Antwerp which would fail if moved from LCY. All that's left is a daily flight to Florence and a few weekly flights to provincial France in summer. Hardly worth it.