I don't know if you've noticed, but you've probably seen that transaction costs on the Bitcoin network are at historic lows. To some, this might seem like good news...yes, they are, as long as you want to transact with Bitcoin on-chain...the bad thing is that it doesn't seem like many people are doing it. In fact, Bitcoin blocks, which are closed every 10 minutes, contain fewer and fewer transactions...which indicates that the network is being underutilized, according to what we can see in MEMPOOL.
This is obviously bad news, since, although at this point we all think that Bitcoin is, above all, a store of value and, therefore, something to be held until the end, if the fees aren't attractive to miners, they may decide to stop mining if the "business" becomes unprofitable for them. They still have room to mine since the price of Bitcoin is well above what it costs to mine, at least 40% above, but that's not that much if you think about it in perspective... If tomorrow there's a market crash of, say, 40%, let's see who's the smart one who's still mining at a loss then?
It seems that in the end, the introduction of Bitcoin ETFs and everything that entails, that is, the trading of paper Bitcoin, could be the "Achilles' heel" of the whole invention... We'll see.