Your analogy of hearing thunder and knowing that a storm is close has nothing to do with the end of Watchtower.
You go on to say 'it's not years away.' Fine. You say nobody can know when it will be for sure, but if you know it's not years away, then is it then just months away?
And if we go 5 more years from now, and Watchtower still exists, will you feel a need to rethink your ideas?