This story from the Limerick Post indicates that Ryanair does seem to be pressing ahead with it's fleet reduction at SNN
This story is based entirely on the website's booking engine for Summer 2010.
And yes the schedules are pretty scant. However to operate what
is in the booking engine they will need 2 aircraft. And it is very possible that routes like Charleroi, Alicante, Birmingham, Bristol, Prestwick etcetera will end up being operated by aircraft based at those airports.