Also, lack of awareness and education about the use of cryptocurrency is another reason why people will always choose cash. Lots of people are still clueless about how cryptocurrency works and how they could use it. Normal people still prefer cash because it's acceptable in all forms of businesses and different transactions.
But for how long? Cash won't always be an option. Loads of governments are looking at phasing cash out. There will come a time where you don't have a choice. It'll either be Bitcoin or some centralised digital gov-coin.