All the jumping skyjackers who followed Cooper survived, but were also captured soon after they jumped.
Let's be clear, one of the reasons the guys who followed Cooper were easier to capture was because of the information (i.e. the 'bump' indicating when the hijacker actually jumped) gleaned from the Cooper hijacking itself. Since that information was not present for the Cooper hijacking, the conclusion "Cooper would have been captured had he survived based on later hijackings" is a logical fallacy.
Further, McCoy was caught because he talked to others before the hijacking and lived near the jump point. Richard Charles LaPoint was captured because the authorities put a tracking device in his parachute, then followed his snow tracks (again, neither element present in Cooper case). Frederick Hahneman spent a month in Honduras before he gave himself up (nothing applicable to Cooper case). McNally was caught with a fingerprint. Really, on Heady's jump is at all applicable to Coopers, because Heady was actually captured with agents on the ground. But they were only there because they knew where he jumped, because of the Cooper case.
So, a recipe for getting away with the crime would be: don't leave fingerprints (or at least, not already be in the fingerprint system), don't talk, be first so they don't know about the jump, don't have a tracking device in your parachute, don't surrender yourself. We know for sure Cooper was good on three of these points, leaving only fingerprints and talking as the way to catch him. If Cooper was not previously a criminal, and if he was a lone wolf, he is in a very good position to get away with the crime.
Cooper may have died in the jump, but assuming he died because he was never caught is to assume our law enforcement system is 100% effective. And that has never been true.