I might be overgeneralizing, but I feel like 10-15 years ago everyone wanted to do wireless communications, now everyone wants to do AI, and probably in a few y

I might be overgeneralizing, but I feel like 10-15 years ago everyone wanted to do wireless communications, now everyone wants to do AI, and probably in a few years everyone wants to do Blockchain or something else. I kinda find it hard to believe that those people are all passionate about the field, not the massive career opportunities.