You'd be nerfing on hit builds, which are already not amazing because they require late game to be relevant, just by removing the 5% attack speed. It might even be the final nail in the coffin. I also think it's ridiculous to remove masteries. I mean, I dislike dying as much as the next guy, but I don't think removing masteries is the way to go, when the choices you make in masteries are so interesting and fun to experiment with. If they want to nerf damage they could easily just increase the base armor and magic resist of every champion in the game to make it so that they're not taking as much in the early game, or if late game damage is the problem, armor and MR growth. There's more than one way to skin a cat, isn't that how the saying goes? I also disagree that there's one keystone that you'll pick dependant on champion. For example, if I wanna go on hit TF, I can either go thunderlords, warlords, or fervor. Warlords or Fervor would help because it'd add extra attack speed. If I wanted to go AP TF, I could go for Thunderlords or Stormraiders. Stormraiders would help with positioning after I got off my combo, Thunderlords would add more burst. Same for Diana, I can go Thunderlords or Stormraiders, or even Windspeakers if I wanted more shield power, though Windspeakers would be a waste most likely as you can't heal allies, but if I needed the extra shield power for the matchup it wouldn't be terrible probably. All ADCs can either go Warlords or Fervor, they prefer Warlords though right now cuz they like to get lifesteal later on and it helps with that. Riven, I can go Fervor, Thunderlords, Stormraider's, or Courage of the Colossus. It really depends more on matchups and what you feel would be best for the situation rather than "Which champion am I using", or on occasion it can depend on how you want your playstyle pattern to be, for example do you want more chase potential as Diana? Choose Stormraider's, but if you want more burst, choose Thunderlord's. There are a lot of possible options for many champions, dependant on playstyle, champion matchups, and whatnot. Just because you only SEE one option doesn't mean there aren't other viable options.