The scientists are arguing whether the Universe will ultimately collapse into one huge badass black hole (so-called
Big Crunch) or explode into nothingness (so-called
Big Rip). The Big Rip event essentially means that all the matter of the Universe including stars, atoms and elementary particles as well as spacetime itself will be ripped apart by the expanding Universe in a distant future
The Big Crunch in respect to Bitcoin would mean accumulating all bitcoins in a few or just one pair of hands, but this is not very likely to happen, so the Big Rip seems to be more probable as we see with the price skyrocketing right now. Given the Bitcoin infinite divisibility, the Big Rip of Bitcoin would mean the price per 1 BTC shooting through the roof, moon and farther into the depths of the Universe, which would completely dissolve the coin and all its 21M units in the financial spacetime...
So how likely is this, and what is your understanding of how things might unfold in real life?
Both of them are unlikely, bitcoin is merely a new currency which basically is maths not a cosmic object that it would behave the way the universe is working. I am pretty sure concentration in bitcoin in one hand is certainly impossible, and price skyrocketing has more or less already happened, imagining hypothetical numbers is good but $60k per bitcoin isn't really less. It's better if we quantify the expected value of Bitcoin in form of maths rather than shooting up roof, moons and stars which make absolutely no sense.