The stability of bitcoin is important because that will create usability and we will see massive adaptation by the mainstream society. Many people are scared to venture into cryptocurrency because it is highly volatile
You are right, stability create usability and mass adoption, but essentially not because this way it will attract more investors.
For sure, stability attracts more investors, but this isn't the main point.
The main point is that stability allows cryptocurrencies to become money."A “stable coin” is a cryptocurrency that is pegged to another stable asset, like gold or the U.S. dollar. It’s a currency that is global, but is not tied to a central bank and has low volatility. This allows for practical usage of using cryptocurrency like paying for things every single day.
Coins like Bitcoin and Ethereum and highly volatile. On any given day, it is common to see an increase to 10-20% or even a decrease. That makes using most cryptocurrencies for daily transactions inconvenient. Imagine paying $5 for your flat white (my coffee of choice) today and finding out tomorrow that it should have been $4. Price changes like that are shocking for a consumer."
https://www.forbes.com/sites/shermanlee/2018/03/12/explaining-stable-coins-the-holy-grail-of-crytpocurrency/#222c9e704fc6I don't see Bitcoin as able to become so stable that it can get used as everyday's money.