Futon Mattress Cuddle

My son has a futon bunk bed. He would very much like for the futon be be gone. He wants me to take out the futon and put a few video chairs and a small table under the bunk bed in place of the futon. I personally like this idea because ... well, my son is on his way to being sixteen years old and it would make me a lot happier if there wasn't a place for cuddling or laying down with such easy access if he had a girl in his room! Hee hee ... With the video chairs and table set up, he could play his games, the table could double as storage for his games and controllers as well ... and there would be no big bulky futon mattress to mess with. My question is would doing this compromise the structure or sturdiness of the actual frame in any way? Would taking out the futon make the bed shift or crook while he was sleeping on it?