Of course. But if we want to reduce CO2 emissions then buses will still need electrification - and therefore require PFAS.
Furthermore, public transportation will not be able replace all private vehicles. Or at least, it cannot replace them all quickly enough to avoid catastrophic climate change. By the time the necessary infrastructure was built, it would be too late. Therefore, electrification of private vehicles will be necessary, which will also require PFAS.
Basically, we are at a late enough stage of CO2 emission that the only realistic hope of avoiding catastrophic climate change requires mass production and adoption of EVs.