And why this will not happen
It took Aer Lingus too long to realise what a waste of a resouce Shannon Heathrow was. None shall replace them because it is not a good use of a Heathrow slot. Nobody will.
Dell will be no more likely to close down because of this, as it takes as long to get to Shannon airport in the morning and the evening as it does to get to Cork airport. Many companies will use it as an excuse to leave Shannon / Limerick. It will not be the reason.
All this talk of link to global destinations is pure speculation. Asia and Australasia can be connected through New York, Chicago and Los Angeles. A lot of Europe through Gatwick as well as Northern Africa and Carribean failing that Cork is not that far away.