Then, people recognized the benefits of bitcoin and start buying it and hold it as a type of investment.
Yes, more and more people are interested in buying BTC, but mainly because it's profiteering potencial. If you check the topics about investments, people are often refering to the actual value of BTC. Many of them have target BTC/USD ratio that they will move all their coins to gain profit.
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Keep in mind that Bitcoin can still survive no matter how the world change, while Fiat can be destroyed by physical damage.
Actually there are even more threats to your public keys. If you:
- print it on paper -> it would be damaged as well as paper notes
- flash/optic drive -> physical conditions including UV light
- hdd drive -> as above, but EMP instead of UV
- cloud hosting -> most risky, many of threads here
- carving in stone seems to be most secure
.... and this is only for assumption, that people still have electricity and internet. Without access to blockchain, your private keys are useless. I can imagine that world can change this way.