Purple,
I'm afraid that without the UK to hold our hand and with a re-energised French leader who seems determined to go after corporation tax as part of his overall strongly pro-european agenda, we could be in big bother here. A re-elected Merkel and a nasty scrap over Brexit will see an emboldened EU push harder for much stronger integration, some of which could be very hard to swallow. But Paddy always takes his EU medicine, sometimes he just has to be told twice!
I do not expect the Irish govt to stand strong on tax for too long. They'll claim some sort of a pyrrhic victory from a debt write-down/renegotiation etc. But they will give in.
Thats my pessimistic take on the whole thing