The game changed, it went beyond the "microcomputer" concept in ways this guy couldn't conceive. But that does not mean he was wrong.
The days of the lone hacker writing assembly code for the "microcomputing" business DID came to an end. So did the days of the lone hardware hacker building and selling computers from his garage.
And programming did became a generally collaborative effort.
Lone hackers will always exist. It's just the layers of abstraction that change. Wozniak worked on top of ICs and electronic components. Now we tend to work on top of complex kernels, libraries and so on. So what? The stuff below tends to be a million man-hours achievement, hackers work on the fringe... I don't think that pattern has changed.
The days of the lone hacker writing assembly code for the "microcomputing" business DID came to an end. So did the days of the lone hardware hacker building and selling computers from his garage.
And programming did became a generally collaborative effort.