I've long thought "personal assistant" is the huge opportunity for Siri, Gemini etc.
If it works it would really help your daily life. But I'm going to be letting others beta test it for a few years before I risk letting it go wild with my credit card based giving it instructions I hope it understands and follows.
I wouldn't pay $200/month for it or anything like that either. But I could see $10 or $20 a month, depending on how much time it actually saved me per week.