People are still starting businesses here and people that are dodging tax through Ireland are employing thousands upon thousands of people. (Tech: Microsoft, Oracle, Google, Facebook, Twitter. Pharma: Astrazeneca, Phizer, ICON Finance: Creddit Suisse, BoAML, JP Morgan, SIG) Those tax breaks on income tax happen all the time in other countries, a lot of different countries give out large tax breaks for large employers, they know they'll get the money back in income tax from employees.
Double Irish might go away, but the lower tax rate won't any time soon. The Irish government know which side of their bread is buttered.