Here's how I would evaluate it:
The promise of Bitcoin as per the Bitcoin whitepaper and its proponents lies in the capabilities of Bitcoin itself e.g. trustless transactions across borders, banking the unbanked, not controlled by a central entity, self-custody, immutable transactions on the blockchain, and so on.
That promise is why it has value, right? It is a financial instrument that has different capabilities compared to the traditional financial system.
Let's look at the investment case for the Bitcoin ETF:
The Bitcoin ETF is a good investment--because it doesn't require annoying blockchain transactions
The Bitcoin ETF is a good investment--because it is centralized.
The Bitcoin ETF is a good investment--because you can't self-custody
The Bitcoin ETF is a good investment--because it can't be used as a currency or for payments.
The Bitcoin ETF is a good investment--because it can't transfer money across borders.
So if you strip all of the utility out of Bitcoin, it has more value as an investment. Does that seem just a wee bit screwy to anyone else?
It is the year 2024 and Bitcoin is still not being used as was proposed in 2009. Instead it is still being used for crime and as a speculative asset, expected to go up in the future due to events like halving and ETFs. The actual arrival of ETFs is perhaps the last imaginable step in making this speculative asset easier for the non-technical public to access.
So what's next for Bitcoin, now that there are no barriers to investment?
I still don't see it becoming a real currency. If such uses for Bitcoin have not yet developed after 15 years of intense effort, I don't think year 16 is likely to be the special one. Thus Bitcoin will remain a speculative vehicle, albeit without the driving narrative that demand could take off once it is made more accessible (by trusted third parties).
In the post-ETF world, Bitcoin will be another speculative commodity like gold (GLD) or silver (SLV) which you can buy in ETF form but which produce no earnings and are therefore only held long-term by people who appreciate their diversification potential (and those who believe crackpot internet theories).
These ETFs drive a significant amount of investment, but they are not earth shaking news. Earth-shaking news would be a development that causes people to use cryptocurrency for routine transactions. If you believe the barrier to that occurring is a technical or regulatory issue on the way to being fixed, then maybe it makes sense to think Bitcoin has a future. But it would make more sense for someone holding that view to think the next thing after Bitcoin has that future (i.e. why we're not watching movies on digital VHS tapes, even though such devices are technically possible).
So Bitcoin will remain a greater-fool-theory speculative investment, a bet on the growing supply of greater fools, which is not a bad idea when phrased that way. Perhaps we'll hear new rationales too - apps for interpersonal payments, regulatory frameworks, etc.
But I'll prefer to own productive assets with earnings or at least the potential for earnings. Earnings seem to be a stronger basis for a FIRE portfolio than whatever narrative is next for gold, silver, or crypto.