Not entirely true. The Ryanair cut to SNN passenger numbers won't be so dramatic this coming winter. A lot of routes will simply be operated by the aircrafts of other bases, rather than Shannon based aircraft.
But most of them have had a reduction in frequency, as far as I can see, Gatwick, Edinburgh, Birmingham, Beauvais and Charleroi are the only routes that haven't been reduced compared to last winter, or axed.