To some small extent, people are squeezed tighter for cash and headlight bulbs are more expensive than they used to be not just due to inflation but design.

Also most people probably don't notice for a few days. Even if they do they may forget or not be able to run out the next day to get one since when you are most likely to notice it's late and stores are closed or closing.

Also, seeing like 3 people in a day if you drive any appreciable distance is probably like a fraction of one percent. It doesn't take a long time to see a hundred cars on the road. If you're commuting on decently trafficked roads you could see a few hundred daily, and you only remember the ones that stand out.

Combine all that with the fact that we're almost at the point where it's darker for the most of the day and it makes sense that you'd see a few every day. I know I do.