The lifespan of an MLB trade for a veteran player does not typically last very long. The situation with the New York Mets and Yoenis Cespedes is a little different as it involves a re-signing, opt out, and another re-signing.
Cespedes has been reincarnated as a member of the Mets several times now. During this time, he has gone from being the GOAT to becoming a goat.
When he first joined New York, fans fell in love almost immediately. Without him, the Mets wouldn’t have gotten to the 2015 World Series. His hot August and September lifted them over the Washington Nationals.