It's understandable cause apart from being able to stabilize price volatility, stablecoins are also supported by multiple sources of assets. It could be a traditional currency like the US dollar, commodity, precious metals, or algorithmic functions, or other cryptocurrencies.
However, the risk level for stablecoins is greatly influenced by its backing, so isn't that a "too much" claim?
https://markets.businessinsider.com/news/currencies/avalanche-avax-emin-guen-sirer-founder-bitcoin-stablecoin-tether-usdc-2021-10
https://swapzone.io/blog/stablecoins
He is right. One of the reason many people stay away from crypto is their belief of how unstable crypto is. Stablecoins as an investment would be a good introduction to such people.
We can see how prominent the stable coins are by marketcap. And if we are to have a bullish market, larger value would be driven to stable coins and we could probably see stable coins being on the top of crypto by marketcap. There were several predictions about which coin would replace bitcoin and it would not be a wonder if it would be Tether.