This is normal. Once you solve the biggest problem, something else becomes the new biggest problem.

The biggest problem with tailpipe emissions used to be horrendous smog. That was mostly solved in many places, and now the biggest problem is the impact on the global climate.

The biggest issue with childhood mortality used to be disease. Now we (correctly) focus more on accidental deaths.

EVs solved tailpipe emissions, but they’re not perfect. Their biggest problem is just something else.