This should only be considered to having possibilities of happening and nothing close to being certain to happen or guarantee and even if everything is done perfectly well and accordingly it doesn't still mean that it would always yield profits in the future yet I will still say that there is nothing wrong trying to do everything being followed accordingly by staying disciplined and focused through buying with your discretionary income and not selling too soon, I agree with you about Bitcoin being more on the increasing side with the increasing adoption but don't still know what will happen in the future.
That is why it would be extremely wrong to go all in on your Bitcoin investment because the future is not guaranteed, it is true that their is a higher probability of Bitcoin rising up to $1M or more but due to the fact that we live in a world full of uncertainty, going all in on your investment is dangerous because you might contemplate suicide if you invested what you can not afford to lose, but if you invest only what you can afford to lose, if your investment doesn't go as planned in the future, you would not be that shaken financially, but take note that no investment is risk free, including Bitcoin, it's as risky as every other investment out there, but the risk attached to it can be easily reduced to the bearest minimum if you can hold it for an extended period of time.
The statement you responded to does not suggest investing everything including money for basic needs into bitcoin, he clearly stated that discretionary income is what is supposed to be invested in bitcoin. Your idea of going all in is your own making and it has no place in this discussion.
Your idea of bitcoin being risky and the future being uncertain is not also very encouraging for people who might be considering putting part of their discretionary income into bitcoin. This is because we know, from the available data, that no one who held for a decade have lost money in bitcoin. This proves that bitcoin have some level of security even more than some other types of investments that are cajllenged by inflation. People should be encouraged to accumulate bitcoin with their discretionary income, since it is something they can afford to hold for as long as necessary.