In the coming decades like 10 to 15 years to come I'm expecting Bitcoin to transition from a risky and unpredictable coin into a standard wildly accepted investment and everyday tools just as stock, bonds or gold that is used by the government, banks and regular investors where its value will grow at a steady, moderate pace of about 10% per year on average. Where it can be easily accessible for everyday people to have and also could become a standard tool for daily financial operations, where buying and keeping hold of Bitcoin will become very easy to access by using a standard banking app without the need of crypto wallets to access your Bitcoin.
Do you consider this to be a widespread adoption? I'm not sure I use banking to access bitcoin, so exchanges are useless. Lol anyway I do not know about the transactions that are allowed by the government as a means of payment, then fiat will lose fangs.
To be sincere I'm suprised what people expect when they ask such questions
Like how can we really tell when we humans that can see the future............. Always.
Only clairvoyants can see the future... people always go there.

In the next decade, bitcoin will continue to be less volatile.
Well this is my current kepiran... it is likely that the volatility of bitcoin will be lower, maybe my thinking is wrong about this.