Well that's the gamble with OpenAI isn't it? There's some utility now but it's currently unclear when we'll hit a hard wall on what's realistically capable with the models (and their direct successors), and how many things OpenAI will be able to with them.
I don't think anyone knows for sure where that wall will actually be (including OpenAI themselves). While I don't actually think we'll get AGI any time soon from any company[1], if they did manage to fully crack it, then there's really no limit to how much they can actually do and how much money they can actually make.
I certainly don't think we've seen the end of the capabilities though, even in the near term; I think the GPT models have a lot of room to improve and I think that newer models for generative images and video and music and 3D models are going to get substantially better. How "profitable" that will be will depend on a bunch of variables (e.g. costs of GPUs/TPUs/something else, energy costs, potential regulatory hurdles, etc.).
[1] I don't really know what I'm talking about, I'm not a machine learning or AI expert, it's just a gut feeling I have.
In next 3 to 5 years, many of the sparkling icons next to input fields in many products summoning AI would be gradually removed.
OpenAI will have the fate of Twitter. High valuation but not profitable. Subscriptions alone not offsetting the personal and compute costs.