By claiming that the owners are taking a bigger risk than the employees, you're implicitly arguing that employees are taking some risk. Thus, it's surprising that they capture none of the rewards from growth.
Of course, your suggestion also implies a labor market balance that simply does not exist. The article is actually about the fact that corporations are realizing record profits by employing fewer people and paying less to those whom they do employ. It's a buyer's market for labor. Not exactly a strong negotiating position for the worker.