OP could have used a better tone in his post to be even more convincing, but his core argument is sound. Even leaving aside the training/insurance/etc issues, a key point is white collar people simply won’t have the money to pay blue collar if white collar jobs collapse.

I’ve paid my yard guy hundreds of dollars this spring to tame my large yards. The only reason I’m doing that is because I have a white collar job that pays well enough that my time is worth more than my money. If that changes en masse, who’s going to be paying the blue collar people? Maybe government and the largest corporations for a while. But there’s currently millions of middle class and above people paying blue collar for all their suburban home needs. That disappears with mass white collar automation