Don't make too many assumptions about the winter timetable just yet
Hi Jamie,
Do you know that for sure, or are you using the booking engine as your source?
It is possible that Hahn - Kerry will go into winter hibernation, but at the moment we're only in the beginning of July and the winter season (which starts at end of October) is a long, long way away.
Ryanair will almost certainly tweak their winter schedules time and time again over the next couple of months (although other airlines do this too).
If a route is still unbookable at the beginning of September then we can be pretty sure that it won't be operating over the winter. Until then, it's probably best not to make too many assumptions.
It has been known for routes to be withdrawn from sale and then to be put back on sale again. Some cynics might even suggest that this is a Ryanair "negotiating" technique.