"Clog the docket"? Why isn't the court system appropriately scaled to give each defendant their Sixth Amendment right to a fair trial? Because fuck them, that's why.
As I said elsewhere, if you don't like the system, please call your local, state, and federal representatives and request that they support more funding for the judiciary.
Every case going to trial would cost an incredibly unreal amount of money -- there needs to be some streamlining somewhere, and the question is where and how.
There are other ways of avoiding the trial than threatening the accused. Also there are countries that don't seem to have this problem. Perhaps a look outside the US might suggest some alternative ways of behaving that might be used.