Isn’t this just an argument for nihilism? Over a long time anything is possible, but that’s not an excuse to ignore the data that we have right here and now. Never mind that there will never be a point where there isn’t a “long period of time” in front of us, which becomes a convenient excuse for permanent inaction.

Also, anything being possible is not the same as anything being probable. The vaccine might make me grow a third arm too, after all anything is possible in the long run, but you would laugh if I said that I wasn’t getting a vaccine for the fear of my tailoring bill.