The big issue here is whether staff at Ryanair will finally make the push to establish a trade union to represent them. My reading of the irish law is that staff are free to join trade unions and automatically win an unfair dismissal case if they are dismissed as a result of joining one.
Trade unions
The only way you will ever have any real influence is through a trade union and if you ask me this is the best chance you're ever going to get so use it and join one...
What would be really clever is for those of you who already have job offers outside to openly declare you have joined a union, wait to be sacked and when sacked take Ryanair to a tribunal which you will win for compensation.
You will end up not working your notice
You will end up being paid probably a significant lump sum in compensation for not working
You will tie up Ryanair resources in a time of company crisis
Or he will be forced to accept and recognise your TU membership as legitimate.