200 million people aren't going to want to deal with excrement filled pipes, bug, rat, snake infested crawl spaces, understand all the dangers involed and all the other reasons that plumbers and electricians have such high pay scales.
Not 200 million but certainly plenty enough to impact the financial security of trade jobs. People DIY for fun. Now you’re saying it’s the best way to make a living? Well, sure - let’s give it a go. Who will train all these people? Recall we just put multiple industries out of business with a masterful reference and generation program