I disagree. I think the potential for a couple of people working in a garage to do something with serious impact is as great, or greater, than it has ever been.

There are, and always have been, things that are incredibly capital-intensive, of course, but economics change and things that once required multiple millions of dollars are now affordable by normal people. This was true in the past as well -- those couple of guys working in a garage couldn't have done it a decade or two earlier when the costs of such electronics were stratospheric.

Things that are costly now, such as quantum computing, will very likely follow the exact same trajectory.