In the late 1970s and early 1980s Lounges on airliners were the in thing. Lockheed had lower deck lounges on some of their L1011s and Boeing had lounges on their B747 upper deck. With time the fad disappeared mostly because lounges took up space and weighed heavily and they had to give way to economic realities, this same space was used for cargo and/or seats. Even lower deck galleys disappeared to give way to cargo space.
In the 2000s Airbus comes in with the A380 and sells the aircraft as one where you can have lounges, gyms, bowling alleys and shopping areas (click here) with passengers walking around. Fortunately most of these did not materialize.
Great looking lounge areas for the use of the First and Business Class passengers are very unsafe during an encounter with severe turbulence with passengers standing or sitting around the lounge. They will probably bounce off the ceiling, literally.
It is time to go back to basics and have a review of how safe are these lounges and act accordingly.