Because there isn't enough lithium in the entire solar system to actually support everyone using electric cars at least with current technology. Even with projected advancement this won't happen. We're going to need better batteries using different materials. We'll probably get to a point where renewables will supplant the current tech but it's going to be rough.

Also, it is very important to understand that we have probably been in the first stages of collapse for a while now. About 30 years. We just haven't really noticed because the rot is uneven and even as societies collapse they still often continue to progress for some time in various ways. It's just now becoming evident because it can no longer be ignored.

As for bikes, it won't be so bad. We're adaptable creature and we'll find a way to make it work. Cities will get denser and greener, but with less cars they will become quieter and more welcoming places. Public transit options will begin to become viable for the majority of people once again. There's some hope that necessity will help drive a better future. If there is one thing humans are good at, it is adapting to their conditions.