Wasn’t the earth the supercomputer that was trying to come up with the question to the answer of 42? If they just found it, does that mean that they’re done with us?
It's been a while... but I'm pretty sure the opening of the book explained that there was a theory that should both the question and the answer exist in the same universe, it would instantly collapse on itself and begin anew.
There was also a theory that this had already happened.