1. Are they useful?
2. Are they going to become more useful in the forseeable future?
On 1, I would say, maybe? Like, somewhere between Microsoft Word and Excel? On 2, I would say, sure - an 'AGI' would be tremendously useful. But it's also tremendously unlikely to grow somehow out of the current state of the art. People disagree on that point, but I don't think there are even compelling reasons to believe that LLMs can evolve beyond their current status as bullshit generators.