Seriously though, I don't think the Conversation needs to end there (conversation with a capital C - ours can end whenever we want). I do indeed believe in 'mystery above all'. I actually think that's a lovely way of putting it. Because mysteries are just unknowns, and without unknowns, what happens to scientific exploration? Do we just assume we know everything? And then the exploration stops. I'll be more explicit than that as well - I believe in God, and I am somewhat religious. I don't think that cancels me out of any interesting conversations.
I think you're making an assumption when you say that if you hold scientific definitions true then there is no reason why it won't be reached. Science says nothing about the future certainty. It is composed of models whose intent is to reflect reality, testable hypotheses to build and refine those models, and the results of the tests of those hypotheses to validate or disprove the hypotheses. We have no model (other than some vague calculations of processing power of the brain), no testable hypotheses and no results for these projections. It's not science.
But I would say I've proven you wrong that this isn't a good conversation!