I am not worried, I am 100% certain that one day I will see 640k bitcoin and not just 64 because I know that things are looking great for the future of bitcoin.
Is that a typo or do you really think so?
I doubt it is a typo since just a few words later the user you are quoting also put a 64 there.
Like always everything depends on the time frame we are talking about, supposing the bull run is not over, and I think this is the case, then a low 6 figures should be possible, maybe something like 100k to 200k by the end of this year and then we could see a correction, however if we are talking about the next decades then a price of 640k is pretty much a given, now what can you actually buy with that money could be a subject of discussion if inflation gets out of control but that is another topic.