If you say that they already accumulated about 130 000 BTC today, and that in less than 20 days from the approval of the ETF, it would be logical to assume that the total number of BTC by the end of this year will probably be much higher than what you are speculating about. Of course, the current figures can be attributed to the initial excitement, so maybe it would be good to wait 1-2 months and only then start to draw some conclusions.
If you are talking about the number of 500 000 BTC by the end of the cycle, then it is not too much for a period of 2 years - especially if we take into account that Microstrategy "removed" from the market just a little less than 200 000 BTC, although admittedly in a long period. I would perhaps dare to say that the funds could buy even more than 500 000 BTC in the mentioned period, but only for the reason that we are in the halving year, which should mark the beginning of a new big bull run.
As for the new ATH, I think it would be realistic to expect it to be x2 compared to the previous one of $69k - which means at least some $140k and up to $200k if the ETFs turned out to be big BTC accumulators in that period.
Yeah I was trying to be conservative based on the fact that I assume buying these first few weeks will be much higher than where it will settle due to initial excitement of ETFs being available and probably a lot of people have been waiting a long time to get into Bitcoin ETFs and they are going to mostly buying these first few weeks.
But you're right it could certainly be more. Yesterday all the ETFs just had a nice net positive inflow (has mostly been net negative due to the massive Grayscale selling) of over $250 million, so ETFs net buying was probably close to 6000 bitcoin just yesterday. Excluding Grayscale it was more like $450 million of buying yesterday, or over 10,000 bitcoin. If the buying stays up at several hundred million dollars on a daily basis for the next month or two while prices are still low, these ETFs will quickly accumulate several hundred thousand bitcoin and easily trounce my estimates above.
10k bitcoin a day, 5 days a week, 4 weeks a month, would mean 200k bitcoin in a single month.
My numbers were based on thinking the buying would drop below $100 million daily this week or next week as initial excitement fades and settle under $50m daily. And also I didn't realize the buying on the non-Grayscale exchanges was still several hundreds of millions until I just saw the data. Blackrock and Fidelity have each been typically buying $100m to $200m daily, while the other ETFs together buy a few tens of millions of dollars daily, and so far it isn't slowing down.
So while my estimate was meant to be conservative, yeah its definitely possibly I greatly low-balled the demand for these ETFs in the next two years. Could potentially see the non-Grayscale ETFs owning over a million bitcoin by the time this cycle peaks late next year. In which case >$150k peak price seems likely to me, as an extra half a million bitcoin being off the market is a very significant amount of the liquid bitcoin that is out there being traded around.