No, imho it would cause even more issues than right now since capping it out at 50% would basically equate to saying "Hey you, yeah you ADC... We want you to take a gamble each time you throw a auto lol GLHF"
Im not saying that the current iteration of crit is good either... It's a major source of issues for the entire ADC balance, but if you do invest into 100% CRC (4 items) that leaves very little room for anything else in your build...
Also consider this bastard 
If this change were to go through, no matter how you'd tweak him around it, it would end up seemingly stupid for one side or the other...
If you limit him to 50% CRC as well, you're screwing with his balance big time
If on the other hand, you make a exception for him, allowing him to reach 100% with two items (As he does right now anyways) he'd be pretty bonkers and stupid to play against since -> "He can get 100% crit and i cant fml, rito nerf plz"