Did you read the article? Because he clearly explains what the issue is with stage races, or races in general, and how they can optimize this.
Lol, he doesn't clearly explain anything at all. He just states that there will be a time when the Tour can't cover 200 kms but no reason at all is given. Just something about speed limits and villages. Which is not a problem that will become insurmountable given that it is not an increasing issue but just an issue that has been there forever.