No, Toyota quality hasn’t declined. What’s happening is that other manufacturers have closed the gap, and some now clearly exceed Toyota quality. For example, Mazda and Hyundai-KIA have outstanding initial quality. They may not last as long as Toyotas (they are not designed to), but their initial quality is better and more consistent than Toyota.

 https://www.toyotanation.com/threads/has-toyota-quality-slipped.1731649/