A race to the bottom is where you lower standards, wages, or regulations to cut costs and attract business. What's actually happening is the opposite: a race to the top. Every model is trying to get better. Simultaneously they also happen to be getting more cost effective, but it's sort of a coincidence. Companies still require very good models, but they are not picking the "absolute best at any cost" anymore, because it turns out "any cost" isn't worth it.