And at the same time make merchants and other people who do not like will stay away from Bitcoin. If Bitcoin becomes stable, it is obvious speculators will go away but investors will stay. Company will take advantage of the stability of Bitcoin price and there is also a possibility of a merchant boom that will accept Bitcoin as a mode of payment. I believe there is always an opportunist in every kind of situation. Whether Bitcoin is highly volatile or stable, people will adopt it.
This theory makes sense, because most people are interested in Bitcoin solely for the sake of profit, and they are most interested when the price is rising. If the volatility disappeared, the game would change completely, but somehow it doesn't seem to me that it would be positive for Bitcoin in the sense that it would eventually become accepted as a means of payment by more merchants.
They can do this even today by using payment processors that allow them to completely avoid volatility because the customer pays in BTC and they receive FIAT in their bank account. Therefore, I think that from the side of merchants, volatility is not a problem, but the real problem is that globally less than 5% of people are somehow involved in cryptocurrencies, and a very limited percentage uses Bitcoin as a currency.
In other words, the user base is so small that it does not motivate merchants to even think about offering such a payment method.