If BA CityFlyer are expanding, what do people think the chances are of starting a LCY-NCL route?
Zero, English domestics into London are dead and gone with a handful of exceptions due to APD and railway "improvements". flybe went into LGW-NCL and LBA and had to drop LBA. Eastern couldn't make NCL-LCY pay on a Jetstream 41 so BA aren't going to succeed on an ERJ-175.
I always thought that CityFlyer, although being a BAConnect spin off would be quite at home at Gatwick, the home of CityFlyer Express and where the RJ100s were delivered. Smaller aircraft on point to point works well at LCY, it might be the savious of a BA presence at LGW. However the cost base would need to be CityFlyer and not Mainline.