While I agree with Riot is should be in the game for the obvious reasons (A tank just sitting on a minion wave making it so his laner can't CS), it definitely needs to be worked on internally. They need to make it so the minion AI understands when a player is trying to get through and move out of the way. I don't know how they would do this but I trust that as a wealthy Game Development studio they could manage to create a system that did just this.
I don't how well this will translate in-game but thinking about logically it fixes the problem people have an issue with, getting cock blocked. And to reiterate this would be a mechanic that only triggered when minion block would usually happen, this shouldn't be something that allows people to manipulate there own waves,