It's only debatable among people who never built a business in their life, not not among entrepreneurs.
> Microsoft falling prey to antitrust only led to a new generation
The slap on the wrist Microsoft received with the antitrust action was completely inconsequential on the subject matter (browser bundling) but managed to discourage the company and thus reduced competition exactly when we needed it the most: at the onset of the mobile wars which were fought and won by companies already founded at the time of the lawsuit - instead of startups. Because regulation favors the incumbents. Always.
And you can't count the unfounded startups but I am not happy with the state of competition in today's high-tech scene. I remember when there were dozens of compiler, word-processor, spreadsheet, OS and microcomputer companies competing in the 80s and 90s. I blame it squarely on government regulation: the Microsoft lawsuit and Sarbanes-Oxley. Their chilling effect on startup creation was clearly visible in the 00's.