It's only partly the reason, but it's a bit mind-boggling when one finally does some research and discovers that John Lennon's assassination in December 1980 and McCartney's receiving death threats in the immediate aftermath were one primary reason into why Wings broke up as a recording/touring outfit in 1981. Their were other factors of course, but even though McCartney would still continue to have a lot more solo hits in the 1980's and 90's, they never came close to reaching the same creative and commercial pinnacles that Wings achieved throughout the 70's.