They did that. It didn't get any better. How long are you content with wasting time and money on something that's actually gotten worse over time, not better?
And again in your whataboutism comparison, the new one, this time to Edelman, who led the team in drops. He led the team in drops almost every season he played. You overlooked it, because he played at a high level, much higher than what Stevenson has ever approached, and he made key plays in key situations.
Stevenson's simply not good enough of a player to overlook his game-losing mistakes, and justify his bloated salary. He's gotta go. Eat the dead cap this year so you don't have to worry about next year's cap. This isn't a new situation with him. The time for correcting mistakes was years ago.