Giving less than 4 weeks notice of cutting flights will make a new group of people never book with Ryanair again. If effect when you book with Ryanair you have no way of knowing your will fly until a few weeks before. That makes planning a trip difficult as hotels & Cars could get booked up. Ryanair refunding you 30 euros is not much help if everything else has been booked.
I do hope some people who have planned christmas & new year trip sue.
All Airlines cut routes but they give people months notice and do it before the planes are booked up. Most also try to help those messed around by finding alterative flights. With ryanair its just your money back. The fact you will not need the carparking at Stansted is not their worry.
Fly with any other airline if possible.