So in 20-30 years we might see another one?
Part of me wants to think we're going to see more - only because we're in the era of the "disposable manager". Notice how a lot of the names being bandied about for some of the openings are primarily recently retired players (i.e. David Ross, Carlos Beltran, Mike Piazza, just to name a couple). I think as GMs and Front offices try to exercise more control over the team, and strip some of the responsibility from the manager, the manager seems to be more replaceable, and they'll likely go with someone less experienced and more impressionable.