It's probably wishful thinking that BE or EI would start a proper (i.e. at least one a day, EVERY day) LON schedule, but if one of them did, who'd give me long odds on RYR re-instating the second daily STN as direct, destructive competition?
RYR are good for sunshine routes, and as I've said in the past, have been good for Derry, but have now proven how cr@p they are for an airport of LDY's size when it comes to regional routes.
Another operator, with smaller airframes and better frequencies, is what Derry needs now.