For the sake of not giving Microsoft and a few other tech giants immense power over the world, I really do hope the cost and efficiency of LLMs improve dramatically, until we can get GPT-4-equivalent models trained on a few graphics cards and running offline on an iPhone. Really rooting for these kinds of projects until someone makes the breakthrough.
My sincere belief is that local models is the way of the future, with flexible base models adapted via Lora and context to specific use cases. I think open source models and techniques are inexorable at this point barring some sort of regulatory moat and will rival commercial models in all but extreme cases.