Why should Ryanair be a problem for Lufthansa ?
Lufthansa has not axed their services from Frankfurt to London, Barcelona, Rome, Venice, Pisa, Stockholm, Oslo, Riga, Gothenburg, Milan or Bologna just because Ryanair have begun to serve those destinations (or pretend to....) from Frankfurt Hahn. Both airlines certainly serve different markets, particularily if you have two tertiary airports as remote as PIK
and a once daily flight compared to two or three daily flights with a CanRJ from GLA
The main problem at FRA
are slots, they are so precious that Lufthansa certainly has better use for them than for a short-haul route that serves a market that to some extent is served from EDI
already and that would syphon off pax from bmi's connecting traffic through LHR