Despite what I just said, I do hope so, because I'm really not inclined to pay for it, at least not very much. I don't need another $100-200/mo bill in my life, and it doesn't provide that level of value as a chatbot. Google is enough.
I'm not sure that free tier will necessarily continue forever though, unless there is a way to monetize it (presumably by advertising, or by selling data they've gleaned about the user), or perhaps if there is no privacy and the provider is treating you as a source of free data. Right now we're still in the market-share grabbing "never mind the profits, count the users" stage.
A free tier will almost always exist. Mostly for the reasons you already describe. That's a training ground for their small models as well as a way to get full access to new training data (and advertisements). As well as funnel new paying users. Why would you ever give that up?
I'm not sure that free tier will necessarily continue forever though, unless there is a way to monetize it (presumably by advertising, or by selling data they've gleaned about the user), or perhaps if there is no privacy and the provider is treating you as a source of free data. Right now we're still in the market-share grabbing "never mind the profits, count the users" stage.