Almost all tech has room for progress, ChatGPT is no different, it's just a question of how fast that progress will be.
You can roughly predict the rate of future progress by looking at how quickly advancements have been made in the recent past. In my opinion AI looks like computers in the 70s/80s or cars in the 40s. The tech isn't completely new, but significant improvements are being made every year.
I think the burden of proof would be on you to explain why advancements in AI would stop right here. Conveniently right around the time when AI is able to write code fairly well but with a few bugs.