I really hope that his probable transfer doesn't mean we'll keep rotating like this in all competitions....I prefer to go back to the usual system, with the back-up keeper only playing in the CdR. Ter Stegen is better than Cillessen, so he should play in both the CL and La Liga to maximize our chances of winning those competitions imo.
Then again, I think it's doubtful Cillessen would sign for us if he knew that would be his role, him being the 1st choice for the national team and all. He has some stiff competition there in PSV's Jeroen Zoet and Tim Krul, for instance. Not getting regular playtime would probably mean he'd have to give up his starting place, if not his place in the squad, as happened to Michel Vorm went he preferred being a back-up at Tottenham over a starter at Swansea City.