Pictures of astronauts will be as quaint as black and white pictures of Victorian men with handlebar mustaches and top hats.
I think what will happen is astronauts will become a mythical character of sorts like the pirate and the cowboy. Though pirates and cowboys did exist, they were nothing like what is portrayed by Johnny Depp and John Wayne. I believe in a hundred years many people will have mixture of fact and fiction of the spaceman. In fact I encounter people these days who get 1960s astronauts confused with fictional characters.