Cork Airport's RWY length (or lack of it)situation is as a result of decisions taken 30+ years ago.
The financing of any RWY extension is now dependent on DAA funds.
Sadly for now the traffic levels in Ireland and the state of the country's finances will mean that any state support for such an extension is moot.
To clarify
Dublin will eventually have a new RWY.
Cork will only be in a position to extend its RWY if the state picks up the tab.
Cork is still under the umbrella of the DAA until the issue of the debts associated with the new terminal are sorted.
On 11 April 2008, the board of Cork Airport Authority agreed by one vote to accept responsibility for a debt of €113 million incurred by the Dublin Airport Authority in the redevelopment of Cork Airport in order to secure independence from Dublin Airport
But the separation never happened.