Yes, they will or might be able to manage the flight without too much difficulties as long as the autopilot is on and nothing serious happens. They will be able to follow a STAR or a SID as long as it is programmed and flown as per the FMS...but cut the STAR with a direct to then real flying skills have to kick in to bring the aircraft on final stabilized. Will these MPL be able to do it? Because the push button phase will be over by then....
I forgot, the CAPTAIN will be there to correct, recover and fly the aircraft safely to the runway. With these MPLs the Captain will have a little bit more work to do and in an emergency (where button pushing is of no use) he might be alone....