I don't think it will collapse. It has found product-market fit: mostly gambling, some money laundering and crime, and some legitimate use for international wires and payments under oppressive political conditions (this last part is the smallest amount by volume).
There will occasionally be attempts to pump some new use case (e.g. NFTs), but these are just casino advertising. They'll draw in some new suckers/players and the cycle will repeat.
The maximalist cult will continue to exist as well, patiently awaiting the coming of the space brothers in the form of a massive economic collapse causing Bitcoin to "moon" and become the new global reserve currency. This is identical to the goldbug cult of previous generations and involves many of the same types of people. Apocalyptic cults can exist for a long, long time and failed prophecies do not deter true believers.