The concept of Bitcoin and cryptocurrencies has a strong fundamental value to people. The value of a Bitcoin itself is only indirectly linked to this -- it is

The concept of Bitcoin and cryptocurrencies has a strong fundamental value to people. The value of a Bitcoin itself is only indirectly linked to this -- it is very possible that another cryptocurrency will prove more useful (cf. ETH), and people will switch to using that other currency for their cryptocurrency needs. Yes, Bitcoin is great and enables new things. Bitcoin "investment" / speculation is another thing entirely.