Are you saying, Jamie, that FR is staying at 3 x daily (nominally at least) simply because EI is on the route with them? If that is the case the assumption must be that FR is either losing money on a 3rd rotation or at least not making the money it wants. It could be seen as Ryanair putting itself in thrall to EI.
FR will keep pressure on compitation even if they have to take huge losses as a result. DUB-BRS will most lightly remain at 3 daily for the majority of the time until EI pull off the route or reduce it further. Remenber FR reduced BRS becasoe of charges as Dublin but now even higher charges don't seem to be a problem for the route....
FR are selling seats for the equivalent 25c from Warsaw and Budapest on some routes they compete with Wizz Air on and this is to guarantee that they will be 50% cheaper and they said this had lead to high load factors with very low yield and they say they will keep it up until Wizz drop or reduce. They won't be able to long term.
EI can handle FR very well compared to other carriers. EI regional improves this even more especially comparing the cost of flying a jet verses a ATR.