To be fair, in 1993 it wouldn't be ridiculous to say:
1993-2001: Clinton/Gore
2001-2009: George W. Bush/Dick Cheney
2009-2017: Joe Biden/Hillary Clinton
2017-2021: Hillary Clinton/Evan Bayh
Which wouldn't be too ridiculously off.
This would not have been at all a likely prediction in 1992. Predicting Bush's son wining after Bush had been defeated would not be plausible. Even more unlikely would be the idea of Clinton's wife becoming President, since there was no tradition of First ladies getting involved in politics.
Eleanor Roosevelt was seriously asked to jump into multiple political races. It's not like the idea was unprecedented.