Why have riot destroyed the adc role?

With another patch focusing on assassins and tanks what are adc's now suppose to do in game? Lethality items make it so there is no chance of surviving in team fights if your focused and new tank items have forced a tank meta top and in the jungle so what is the point of adc anymore? The role has become so weak and there is no counter weight in patches to attempt to make the role viable again. Adc has now become the most unviable and pretty much the worse role to main and its state in the game is the punching bag.
Report as:
Offensive Spam Harassment Incorrect Board