I myself fix computers for a living and also do web design as a second income. I'd be considered white collar and I can tell you it takes a real good amount of brains to be able to fix and repair computers and the same goes for coding. I went to college for electronics and computers. Got a degree, got my A+ and a bunch of other computer certs so whenever anyone in the blue collar industry looks down at me I just shrug because I know my services are needed. I've said it time and time again there will always be a need for individuals in this world to be able to fix computers of all kinds. As our lives become more dependent on electronics the more people you will need to fix and service those devices. Also I am certified by Apple directly to fix all their iOS and OSX devices and I see about 7-8 people over the course of the day with an Apple device that is physically broken or has a software problem. I'm confident in my job security
My father is a blue collar worker. Works for the largest office furniture installer in the United States in that of Empire office. Is a member of the NYC District Council of Carpenters. He's been with them since 1983 and is currently a foreman. He said there is decent work now for those looking for blue collar work in NYC. I don't think blue collar jobs are going to go away but they aren't going to be the way they were a good 50, 40, 30, 20, and even 15 years ago.