The toys are made in the cheapest places possible already, there's not a lot they can do now to offset rising costs.
Inflation and those rising costs of resources (like oil/plastic & wages), has to be passed on somehow... either by raising the price points (they did that 4 years ago), or reducing the size of the price points (which we've seen happen each year since then).
If they have a total expenditure budget, a dollar value, for a particular price point, we can't expect the end result to stay the same price or size over a long period of time.

Same thing happens with food, or things that are made in the same place over time (if there aren't cheaper sources to obtain it from).
A BigMac isn't the same price it was 10 years ago, or the same size.