What are the chances of living in a world with no actual money ? 
Definitely no, bitcoin and other cryptocurrency cannot real money disappear which means that bitcoin and other cryptos dont have a power to make real money disappear. Although bitcoin is famous today there are lots of people that are still continuously using fiat because it is the money that they used since they are young.people continue to use fiats not because they are the first cuurency that we've been used to but fiats are actually verry easy to use and all group of people in any ages can posibly used it without restrictions or anything. Not unlike to bitcoin and other crypto that may seem complicated for a regular person.
not all people can use bitcoin because bitcoin needs a device that has an internet , not only that bitcoin also requires the user to have a proper knowledge in technical stuff in order for him to use it succesfully. we all know that there are types of people who doesnt have these requirements , most especially the poorer type.