I think the only places we will be seeing this is on private planes, unless, like pilottim747 said, someone figures out a way to make it worth while and safe.
Can you imagine having a even 2 showers in use on a flight, say from ATL
. Along the way, the seat belt sign comes on due to some upcoming turbulence. How pissed would you be if you JUST got into the shower and had to get out?
Maybe if it was a little larger room with a seat that people get into quickly, if needed. Kind of like a F/A seat? But then, you are still looking at the weight of the water and then also taking up space on the plane for something that likely wouldn't be used much. I don't know about you, but I don't think I would want to take a shower on a commercial flight, first class or not.
Why sit at home and do nothing when you can travel the world.