Given that "engines" are the major limitation, would it have made a difference if they had not wrecked two with FOD?
Not really if memory serves the project only had 10 years flying life in it anyway as that was the projected flying life of the 8 zero life engines they had at the start of the project. One engine already had issues with the bearings as an excessive amount of metal chips had been found in the oil system's chip detectors, while of course both engines on one side got trashed when they converted silicon gel desiccant into glass in 2012. Therefore they have been lucky to get the extra three years out of it after the 2012 incident.