What exactly is the hypothesis?
A) A cataclysmic event wipes out the complete population. In that case there is no consciousness to pass on to a next generation.
That's working with a fairly narrow view of "consciousness."
There is SO much we don't know and will never know in our lifetime.
I believe all understanding is a matter of projection of self so knowledge of self is the root. Through effort in that direction, I sense unprovable truth in my gut.
As we understand things currently, everything has a beginning & an end; however, one of the questions I struggle with is whether or not there was an original point where there was nothing and, if not, how did that original something (from which everything subsquent derived) come to be?