For now it is like a dream. It is far from realistic because the prediction have lots of flaws. He just considered the exponential adoption but disregard resistance and problems that may occur within that time span. It also does not consider competition, who know by that time there is another altcoin that out performed, out growth Bitcoin in terms of community adoption.
certainly it is possible, however it is also possible pigs could fly starting tomorrow and poop nuclear versions of donald trump while in mid flight over tokyo and instead of everyone getting scared, they all just starting asking why a nuclear shithead is falling towards them out of the sky. Anything is "Possible" but that is as well as the price of bitcoin going to half a mil in 2030 not "Probable". Possible means there is a possibility that leads to it and there is as possibilities are limitless but probable it is not as probable means that are there enough possibilities that would lead to this result in the universe being realized? the answer is no. so thus possible but it still ain't gonna happen yo.