The McEvaddy's having bought a strategic piece of land (that AR probably don't want to pay over the odds for) probably doesn't help.
I keep harping on about this whenever it comes up, but the priority should be one single usable terminal. For example - T5 in Heathrow will have enough pax capacity to handle DUB pax for decades. Ditto Pearson "new" T1.
The new stands shouldn't have been lumped onto the existing piers but beside 10/28 between it and the parallel (whenever that happens) - just like at Toronto Pearson. Make that a Ryanair or all-loco 737 optimised pier for simplicity of equipment. The pier can connect for supplies via a cut/cover tunnel which would eventually be covered by 10L/28R and via a bored tunnel for airport buses to run from check-in/bag reclaim+customs at the main terminal or the heritage terminal. I've used YYZ's infield pier twice as SLF and it is not unduly annoying to use, although it adds a bit to your minimum check-in time.
Then you get going on a complete rebuild of the existing main DUB terminal, integrating the old heritage terminal if possible rather than enveloping it, gradually transferring ops to the new building. (It was easier at YYZ as they demolished T1, but they are gradually eating into T2 now which will disappear in due course).
One other thing - the practice of shuttling the Government ministerial aircraft to DUB from Baldonnel to pickup ministers is a disgrace logistically and environmentally and should be stopped.