With regard to DC10's doing low cost in winter? don't think so.
As for MYL's decision to take RYR on in Dublin well, on the face of it this is at best fundamentally flawed. RYR have money to burn compared to MYL. Either MYL have an ace to play or they'll suffer the same fate as GO when they tried steppin on O'leary's patch.
Personally, I bid good luck to MYL as I have zero time for the Dublin bully-boy..but he didn't get where he is by playing fair with anybody so he's not going to start now. The short term winners will be the passengers. They may enjoy it while it lasts