Should bitcoin be the only cryptocurrency for investment?

There are altcoins which are viable long term investment

The established wisdom is clearly now that there are three ‘serious’ cryptocurrencies – Bitcoin, Ethereum and Ripple, which have specific purposes and USPs –  goods and services transactions, smart contract functionality and trade finance respectively -  should now be classified as an investment sub-class in their own right.  They have

Cryptocurrencies as a long-term investment

Don't forget that you can invest in altcoins as well.

The results to date of investment in bitcoin have been spectacular. But what about the long-term? For equities, Benjamin Graham famously thought that undervaluation and low risk together would generate superior returns. Undervaluation is a highly difficult term to pin down, but some combination of (a) the discounted value of