A dynasty is winning more than 1 championship. No matter how good the 1988 Mets were they didn't win the WS that year...
BTW the Mets won 10 of 11 games during the season against the Dodgers in 1988. Not that it matters, the Dodgers won when it counted the most. As you mentioned Hershiser was spectacular that year...
Hershiser had a monster season in 1988. He led the National League in wins (23), complete games (15), and shutouts (8), and his ERA was 2.26. All of which landed him the Cy Young Award, recognition as Major League Player of the Year and NL Pitcher of the Year by
The Sporting News, MVP of both the NLCS and World Series, and a Gold Glove.
Perhaps his biggest accomplishment was that from August 30 to September 28, he did not surrender a single run. The scoreless streak covered 59⅓ innings, breaking the record set by another Dodger 20 years earlier, (58⅓ innings).
Hershiser may not have been a head of state in 1988, but for certain he was baseball royalty.
IMO that year Hershiser became one of a group of super players whose one dominant year highlighted
terrific careers like Lou Boudreau in 1948, Arky Vaughan in 1935, Joe Wood in 1912 & Joe Medwick in 1937!
While historians could disagree about which was the best year of each of these players.
Ruth, Gehrig, Williams, Foxx, Hornsby, Cobb, Speaker, Musial & Mantle all of who had
3 or even more years that might be considered there best by different experts.
Williams 41, 49 or 57, Mantle 56, 57 or 61, Ruth 20, 21 or 27 on & on!