Who currently serves DUB? BD, LH, SK, US, TK, LX year round and AC and OS seasonally - and let's not forget JP! There's also a persistent rumour about TP (though that's being doing the round for about 2 years now...). CO will be joining the fold later in the year. JK's presence is just charter work, AFAIK.
I'd be thrilled if the MUOR strategy was implimented in DUB - there'd be a brand new *A lounge to replace the dingy Diamond Club lounge. LH is the key decision maker here, as they will directly control the movement of LH, BD, OS and LX. SK will surely follow suit, as always.
As I understand it, TATL flights will all depart the new terminal, so, I'm guessing US and CO are already signed up a for a move, along with AC for as long as that lasts.
All that being so, TK might be very lonely if they stayed in the Ryanair pier by the Garda station.