No, it means that Obamacare is working as written[1]. Insurer profit margins are set to the legally permitted ((medical bills) * 15%) - operating costs.
If insurers want to make more money, they can either make medical bills more expensive, or reduce their own operating costs. Reducing the cost of medical bills does not increase the amount of money they make, unless it means they are capturing market share from a competitor.
The problem is that it's nearly-impossible to capture market share. Which insurer do I have? The one that work provides. Did I have any choice in it? No. Did I choose my workplace based on the insurer bundled with it? No. Will my workplace ever switch their insurer provider of choice? Almost certainly 'no'.
How do you capture market share, when all of your customers, and all of your competitors' customers are captives?
[1] Whether or not it was written well is another question.