EI-EIDW->The hands of management are tied. As a state airport, they can't refuse access to Ryanair. Ryanair will pay full fees, unlike Wizzair who will still be on a discount on most routes.
DublinPole->In the short term it encourages competition. Long term it is an anti-competitive move. It will probably force out Wizzair and also discourage others from coming in to Ryanair's territory.