His arguments are mostly pretty silly. The industry has long shown that the best technologies almost never have high adoption rates.
I submit that a major reason some languages are predominate in the industry is because they force programmers to adhere to conventions. These conventions everyone already understands. You don't have to re-explain them in every program you write. And yet it's still really hard to write code that made sense in those languages.
In contrast, LISP can write code that writes code that writes code (yo dawg, I hurd you like that). Powerful? Indeed. Expect anyone else to understand what the fuck you wrote? Yeah, ENTERPRISE QUALITY is so overrated.