If a disease wipes out their hosts, they usually go extinct as a direct consequence because species jumping is a rare trait.
Rare, but not unheard of. With only one exception that I am aware of, really nasty human diseases are those which only infect humans by accident and have a different main host. The exception, HIV, is already evolving into a various strains, at least one of which is much less dangerous than the original.
However, if we ever consider a disease to be an existential threat, wiping out the other host species isn’t something we would have much practical difficulty with these days. We’re already considering that with Malaria, and that’s not an existential threat.
Rare, but not unheard of. With only one exception that I am aware of, really nasty human diseases are those which only infect humans by accident and have a different main host. The exception, HIV, is already evolving into a various strains, at least one of which is much less dangerous than the original.
However, if we ever consider a disease to be an existential threat, wiping out the other host species isn’t something we would have much practical difficulty with these days. We’re already considering that with Malaria, and that’s not an existential threat.