Many of the fleet have been in service with SAS for more than 8 years. They cannot therefore really be considered to be under warranty any more, so unless there is a clause in the contract which states Bombardier would take them back after all this time this appears to be a substantial financial loss for someone else.
Nobody is going to buy them because if they encountered another serious incident in service the press would have a field day. So presumably all their financial value will be lost.
A number of them appear to belong to leasing companies rather than SAS, although aircraft do get sold backwards and forwards between companies as time progresses to gain maximum tax advantage. Who is in the firing line for the financial hit ?