Personally I'd change every fluid I could just for reassurance, in particular, coolant, brake and power steering and these may not have been picked up within the scheduled servicing; I'd also ask them to pull the air and pollen filters to see if they have actually been changed and finally the aux belt is another that amazingly gets charged as being changed at services but often isn't. You can check this yourself with a torch and look for any cracking on the V's...
Regarding the de-lamination this I would think is a gradual process up to the point of failure. The friction material will stay in place right up until the last bit of bonding fails. You can almost read the failure in the discolouration on the metal surface up to the last bit which will look fresh.
I would ask PK Supercars what they did less than a year ago as with my 4200 they were very pragmatic, testing brake fluid, p/s fluid, checking the aux belt and only changing these things if necessary. Once the car is old enough to be out of the main dealer network then many people chuck the Maserati schedule out of the window and do everything by condition rather than time.