Airbus is exploring ways to better use the cargo hold and to generate more income. According to wired.com, the aircraft maker has plans for bunk bed pods in its A330 widebody jets and is considering even more creative modules:
"If the concept works, and airlines find ways to use the bunks to make money without robbing too much cargo space, bunks could be just the beginning. Airbus also showed plans for a lounge, a conference room, a medical suite, and a kids play zone, all to be slotted into the cargo hold. One day, the entire plane could feature swappable modules instead of permanent, regular seats. Airbus’ Silicon Valley outpost, A3, tested hot-swappable cabin module concepts with cafés or spin-class bikes inside. But putting those into production would require extensive modifications to the whole airframe."
https://www.wired.com/story/airbus-beds-cargo-hold/
Do you remember the viral YouTube video of the woman doing yoga exercises on the plane? Maybe she will be teaching classes in the exercise room on your next flight!