Specialists believe that Bitcoin and good ecosystem projects will survive the crypto winter and grow, but many won't make it.
Well, honestly, this is not a news cus it is something that have always happened with every bull run and bear market that follows it, this industry is currently filled with a lot garbage businesses/projects built not as to offer anything or contribution to the growth of Bitcoin and cryptocurrencies ecosystem, but built as a means to which the developers or owners of such project can grab money from as many victims (in the name of investors) they can catch, This is why we all need to be very careful as to what coin or project we throw our hard earned money into.
Some fiat money will also die.
By fiat money, I want to believe you mean stablecoins, if I am correct, then I say yes to that.
But if you mean the traditional paper money, I did say that it might happen, but I don't think it happen in this generation, it is true that we all want fiat to go and let Bitcoin and other crypto currencies take over, but this can not happen anytime soon, and beside, I honestly think both fiat and Bitcoin can still co-exist in our financial system.