There will always be decent pay for a decent day's labor with decent skills and productivity. That includes most of the service industry. In my rural area the tradesmen make some of the best money.
In the digital world that this article is mostly talking about there is an increasing tendency to be rewarded for innovation and productivity. There is a false dichotomy by some of the posters above between "open source software" and making billions of dollars. It is true that proprietary software still gets the biggest investments, but open source software is often at the heart of the very highest capitalizations. People can easily become practitioners in one or more of them and with some extra effort can contribute to one and be in demand.
The difficulty now is that the whole world is competing. The quintessential example is digital services paid by digital currency like bitcoin. The buyer puts up an offer and gets a component quickly and cheaply. But the people who build up skills to work efficiently will be amply rewarded.
With Open Source Software, the software is the razor, Support are the “blades”.