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I don't think a person will ever have accumulated enough bitcoin no matter how much they have, people just need to keeping accumulating and over time they can sell certain percentages depending on their investment timeframe as long as they don't sell everything, bitcoin is still growing and it still has more ATH to achieve along the way.
I think that you are failing/refusing to really think through the matter, if you think that a person might not be able to get to a point of accumulating enough or more than enough bitcoin.
I will give you an example of a person who might have had been in early 30s 9 years ago, and then maybe he had an income of around $30k per year. and so maybe when he first got into bitcoin, in 2016, he might have lump sum bought around $20k worth of bitcoin (let's say averaging around $500 per bitcoin.. So he bought 40 BTC.
He then decided to invest 30% of his income into bitcoin, so he invested right around $10k per year into bitcoin at about $200 per week. So over the
last 9 years, he invested an additional $94k into bitcoin and he accumulated nearly an additional 24 bitcoin.
So right now he continues to have an income of about $35k per year, and sure maybe his income went up to $50k.. no problem.. and he is now in his early 40s and he has 64 bitcoin. He would like to double or triple his income, and I think that he has enough bitcoin and/or he has more than enough bitcoin for his stated goals.
I personally calculate that with
64 bitcoin, he could sustainably withdraw right around $290k per year, and so he has way more than enough bitcoin for his own particular needs and his current lifestyle, even if we might consider that his current income is $50k and he would like to double or triple his current income by currently living off his bitcoin.
Maybe you can proclaim that the guy does not have enough bitcoin, yet based on his already existing standard of living, he is able to increase his standard of living by 5x to 6x of his current standard of living based on the quantity of bitcoin that he has already accumulated over 9 years, which seems quite amazing to me, and if the guys chooses to not to completely max out his bitcoin withdrawal rate, it is likely that every year he can continue to increase his standard of living and without working and just by living within his means, his bitcoin is likely to continue to grow faster than the rate that he would be withdrawing from it, especially, if he might start out by merely withdrawing somewhere in the ball park of his current income (while quitting his job or perhaps he could choose to double or triple his income, which would still be way below the maximum withdrawal rate that he could accomplish in the event that he wanted to start withdrawing more.
I think that a person who wants to live off of
$80k per year from his bitcoin, he would currently need to have 17.56 bitcoin, and surely if he has more than that quantity of bitcoin, then he has more than enough, and if a guy only has around half of the 17.56 bitcoin (such as 9-ish bitcoin), then he could merely HODL for 3-ish years and reach a similar level of sufficiency in regards to his bitcoin stash being able to sustainably support a $80k per year income.
Let's say you have accumulated a lot of bitcoin and you are holding off on accumulating for a while, this would be the perfect time to start accumulating again to increase your stash and boost your holdings before the price goes back up again, and for a newbie, there is no time like the present, keep growing your portfolio and as long as you can afford it, lump buying would really favour a person right now, if you can't afford it, just stick to DCA and grow your bitcoin with your discretionary funds.
The building up of a bitcoin investment to get to a point of being enough or more than enough likely takes time and it is not guaranteed to be successful, even though I think that you are correct to suggest that just ongoing investing into bitcoin is likely going to help to make progress in the direction of getting enough and/or more than enough bitcoin.