I actually expect the Blue collar workers to do some catching up to the high tech workers over the next 10 years.
There does not seem to be that many people interested in trade work so I expect the Trades to do a lot better over the next 10-20 years.
Seems most were pushed through college and expects a desk Job, so knowledge worker desk jockey workers will be a lot easier to find than they were during the last 20 years.