CPUs (and a million other things) got better and cheaper with time, I see no reason that AI would be any different.
The distinction between frontier/non-frontier models doesn’t matter much here, for the overall market. With CPUs, for example, Pentiums got better and cheaper while Cyrix/AMD did the same.
The real question is not if the technology is going to get better and cheaper, but rather if it's going to meet the market expectations to justify trillions of USD in valuation.