That has been the main narrative and delusion of the majority of Bitcoin and Ethereum maximalists.
'Bitcoin will be the world reserve currency',
'Bitcoin is a great hedge against inflation',
'It's the future of money',
'Ethereum will be used for everything',
'Smart contracts for DeFi, Healthcare, Law, etc will be the future', etc.
Hence this maximalism, is what infuriates the hard anti-crypto folks for years who are praying for the 'complete and total collapse of all cryptocurrencies' and suggesting 'All of it should die in a fire' and a 'Total ban on everyone using them'. We have heard the same calls for this for more than a decade, yet it's 2022 and they are still here, which tells me that the anti-crypto folks are also under their own delusion and crypto is not going away that easily.
A more realistic outcome of what will happen to crypto rests all on the regulations, which many companies have been waiting for before re-entering again into using them. This is the reason why it won't 'just die in a fire' easily or that it won't 'take over the current system'. The regulators are not after Bitcoin, Ethereum, etc. but are after the truly decentralized privacy coins, privacy tools, etc to be banned from exchanges, de-listed, contract addresses blacklisted etc.
The reality is the two camps that will be disappointed are the absolutist pro-crypto folks and the absolutist anti-crypto folks as both of their utopian goals are unrealistic. With regulations around the corner, this makes sure that customers like Stripe, MoneyGram, etc hand picks cryptocurrencies that work for their use case, especially the ISO 20020 compliant cryptos.
Like it or not, crypto regulation and compliance is coming and that will allow cryptocurrencies and projects to survive and at the same time it will weed out the useless meme projects.