No. SAS can't increase wet-lease more with the "new" agreement. The quotas are already full with the 9 aircraft in SAIL and the ~25 CRJs that are wet leased.
What could be done in accordance with the agreement is to launch SAIL as an own brand, selling their own tickets, having their own marketing etc. but be restricted to only operate routes that are not profitable. That's how the agreements between the unions and SAS look like and has looked like for many years. I wouldn't hold my breath waiting for that to happen.