That means that the licenses would be a lot cheaper for Google to buy. Think of it this way, if you're Google and you want spectrum, you want it as cheaply as you can get it. By making it less attractive to others (eliminating the possibility of oligopoly profits), you make it so that others won't bid as much. Google was trying to reduce the value of the license - reduce it for others in a way that they didn't want to use it.
So, it is still likely that Google will purchase the spectrum. If they wanted it before, they still want it now. They'll just be a bit peeved that they have to pay more than they would under the open access rules they wanted. Remember, the winner of the license can make the spectrum as open as they want.