I wouldn't be shocked if one bitcoin is worth $1 million in ten years, but I would honestly be shocked if it were being used as a medium of exchange. I see it as less probable than people mailing gold bars back and forth to each other.

I unironically think Dogecoin has a much higher chance than Bitcoin of being a legitimate and popular medium of exchange in the future, in part because the supply isn't capped.

I think cryptocurrency may drive a lot of commerce in the coming decades as an actual payment mechanism rather than a speculative security, but, if so, I don't think it'll be Bitcoin that wins that race. I suspect the value will still be fluctuating frequently and violently in ten years.