I don't know if they plan to get rid of them next year but I know they have wanted to off-load the E195s as soon as possible, but making deals with Cardiff and Doncaster means that the deals are covering the costs so the airline doesn't have to worry about them costing the airline anything. I suppose it depends how long those deals last for...? once the deals end, they will get rid of the aircraft. I suspect its then up to the airport/airline to broker deal to see if the routes can be retained with other aircraft.
This is a big test for DSA in my mind, but also a great opportunity for DSA to prove/show what markets exists in what has been an under served/untested south Yorkshire market for years!