While I suppose it makes sense for all the Jedi to have different color sabers....realistically it looks downright goofy seeing so many of them onscreen at once.
I really like the idea of making them all blue or slightly different shades of blue. Visually that way looks less like a bunch of kids swinging around nerf swords.
Imagine a bloody WW2 battle with soldiers annihilating each other with a different color machine guns.