Ally all your fears. Even if he were President, Gore couldn't just "join" Kyoto. It's a treaty that has to be submitted to the Senate.
Of course, things change and there's always the chance that instead of the informal 97 - zip Kyoto got in the 90s the vote would reverse.
But again, Bush and his crew are adapting Kyoto piecemeal anyway, so what's the difference?
As I recall, the Senate voted 95-0 against even considering Kyoto.