Whatever that causes a particular high skilled type of a job to become a low paying job now , it will be even worse in future. Ex. writing is a very high skilled job that is hard to survive on now, so it won't get any better. If technology is making a particular type of job to be very competitive then the quality of skill set becomes unimportant.

The blue collar jobs have been under pressure in the past because of importation of cheap labor. some people nowadays believe blue collar labor will become high paying; not me! They will just shut the businesses down once the blue collar labor becomes expensive and they would just import.. That is how the system works. The current system is designed to give capital more power than labor; in my opinion that is.

So is there a job that will be unexpectedly high paying ; obviously there will be some but only a few people will get lucky and game it correctly. It is not predictable.

GP is saying of that if a particular job isn't well paid now, it won't be in the future. In other words, if you want to find a well-paid job in the future, look for the kind of job that's well-paid now. GP doesn't say why, but do you really wonder why?