There are plenty of components for which the relentless drive to newer, finer geometry parts really doesn't exist, though.
For example, a linear voltage regulator is what it is; chances are that the device in your existing design gets warm at a rate determined entirely by the voltage drop and current, and dissipates that heat through a package that's governed by geometry and the thermal conductivity of copper. It's essentially 'problem solved', there's no benefit to be had by redesigning a product to use a newer one, and a smaller die certainly isn't inherently 'better'.
The same might be said of many other components; once a design is proven, swapping to, say, a newer op-amp doesn't represent an opportunity to improve the product, it represents the need to re-test and qualify something already known to work. A change (even to a 'better' part) is almost entirely a burden for the manufacturer, not a benefit.
These parts might not be exciting or high value, but almost every design needs them. And so what if your CPU has been replaced by a new one that's half the die area, and as a result, fractionally cheaper? You've still got to redesign the board to use it, and fingers crossed you can get the other parts that it needs in order to be useful.