Human minds are built to find patterns, and you should be careful not to assume the rate of improvement will continue forever based on nothing but a pattern.
The overall trend in AI performance will still be up and to the right like everything else in computing over the past 50 years, improvement doesn't have to be linear
Just the fact that even retail quality hardware is still improving at local LLM significantly is still a great sign. If AI quality remained the same, and the cost for local hardware dropped to $1000, it would still be the greatest thing since the internet IMO. So even if the worst happens and all progress stops, I'm still very happy with what we got.