I think bitcoin will be around in a 100 years. Gold has been around for thousands of years and fiat money has been around for nearly a century. Bitcoin will be here as long as it survives regulations or any unforeseen technical issues.
If Bitcoin were to last as long as gold and paper money, then Bitcoin would be recognized as the most acceptable currency in the world. But if Bitcoin is imagined in the next 100 years, it is the most in the world It can be said for sure that it will be recognized as an acceptable currency.