A new way to balance marksmen?
What if ranged attackers couldn't attack at full strength within 150 (Vayne) to 200 (Caitlyn) units? Current situation: Jarvan jumps in on Caitlyn late game. She starts auto attacking him for 800 dps a second. Even if he kills her he will probably still lose at least a good half or more of his health. Assuming he manages to kill her and not the other way around.
My thinking is this: Should ranged attackers be good at both far away AND close up? If Caitlyn lets Jarvan get up in her face shouldn't she be punished for it? If she had a penalty of -50% damage to close ranged targets she would have to mind her positioning more instead of thinking "Can I kill him faster than he kills me?".
I think that if they did this not only would it give markemen an exploitable weakness, but it would better allow Riot to buff them when they play as intended. (At range.)