I don't think it's subscriptions so much as consumer startup pricing strategies:
Netflix/Hulu were "losing money on streaming"-level cheap.
Uber was "losing money on rides"-level cheap.
WeWork was "losing money on real-estate" level cheap.
Until someone releases wildly profitable LLM company financials it's reasonable to expect prices to go up in the future.
Course, advances in compute are much more reasonable to expect than advances in cheap media production, taxi driver availability, or office space. So there's a possibility it could be different. But that might require capabilities to hit a hard plateau so that the compute can keep up. And that might make it hard to justify the valuations some of these companies have... which could also lead to price hikes.
But I'm not as worried as others. None of these have lock-in. If the prices go up, I'm happy to cancel or stop using it.
For a current student or new grad who has only ever used the LLM tools, this could be a rougher transition...
Another thing that would change the calculation is if it becomes impossible to maintain large production-level systems competitively without these tools. That's presumably one of the things the companies are betting on. We'll see if they get there. At that point many of us probably have far bigger things to worry about.