They also have time travel which played a rather important role in Enterprise
, Archer even already knows he'll be some kind of important historical figure thanks to Daniels' fanboyism, so there's no reason they can't somehow pop up in the 24th century or anytime else with the others. It's certainly possible storytelling-wise but I suppose Generations
will be the closest we'll get to a multi-Captain story for a good while, yet.
Why is everybody assuming that a title like "The Eleven Doctors" would have such a literal meaning anyway? It's an easy way to mislead the fans if it doesn't - like, there weren't an infinite number of Doctors in The Infinity Doctors, after all...
Nor did we see the next Doctor in The Next Doctor