I think Cork is going to have to work with what its got for the foreseeable.
The old terminal wont be opened to Ryanair and the runway wont be extended. No realistic proposals have been put forward for how the runway extension would attract additional custom. If EI or a US airline says "we will come to Cork if the runway is an additional 500-1000m" thats a different story, but right now they choose Dublin or Shannon. My understanding is that the A321neo has better performance than the ceo models and possibly the MAX, so BOS is possible, but JFK marginal.
While the A220 would be a perfect size for Cork and Swiss demonstrated that nicely, no likely operator has it on order, unless AirBaltic fancy picking a fight with Ryanair their -8200s and deep pockets. I think Cork is 'stuck' with AT7s and A320/738s for the foreseeable. I think this recovery will be driven by leisure travel, so I think fewer frequencies to a wider range of destinations is how the departure boards will look. Testing is going to help, but will be an additional cost to factor in, especially for families. So 10+ weekly services to Malaga seem a long way off.