I agree with OP. I can't stand loud talkers on cell phones who have no sense of themselves.
At a lot of the tech companies with open-space style offices they have installed modern phone booths. There is no phone, they are for cell phone conversations.
It gives the person on the phone privacy and it keeps noise down for others. These would be a fantastic solution for Sky Clubs.
Here are a few pics from a google search of creative versions of these: