Token based pricing will not be understood by common user. Per-question pricing is psychologically repelling. My hypothesis is that there will be 3 tiers of pricing. For example, FREE (limited to 10 questions per day. Logic is that an average person searches 3-4 times a day). PERSONAL (100 questions/day - $10/month, you will be billed additional $1 for every 300 questions). PREMIUM (1000 questions/day - $100/month, additional $50 for every 1000 questions). Similar to how cloud resources are priced. Most of us will happily pay $10/month. Developers will have to shell out $100/month. 3rd party apps will end up paying in thousands.

This has potential to be disrupted a commodity LLM (say freely available that you can embed in your devices).