Eh. I have to be already pissed off about something else to be really bothered by pseudoscience being close to mainstream at times.
Also, while alchemy itself is basically dead, it's influence carried over in aspects of astrology, hermetic traditions (possibly including Wicca?), alternative medicine and various spiritualists things. Those already have a following, tend to stretch and misunderstand legit science. Face it, you can't eradicate something that offers easy answers and gives you an excuse to wear a cape or cloak.