I could imagine the Ryanair are starting to pull some pax away from Wizz at DSA with Gdansk and Krakow available up the road in Leeds. Certainly Krakow will be taking possible Katowice pax.
While it is giving PAX more of a choice and yes some PAX will use FR from LBA instead, the same can be said for Wizz taking FR PAX at DSA. Just look at the passenger statistics for DSA... Very minor changes with mainly increases on some routes! Add to this Doncaster and its immediate area has one of the largest Polish/Eastern European populations in the UK then I can see why Wizz are happy...
Moving to EMA would make sense in this case if Ryanair decided on more LBA Polish flights. Also,I think there could be more jobs available for Polish workers in the LBA region.
EMA is more of a competitor to DSA than LBA is despite them being in the Yorkshire county. Ryanair have a base at EMA too with flights to Poland, so the same could be said that they could increase flights from there should Wizz move in...