With God, that is, in His realm rather than in the world that He created for a time and purpose...there is no timeline. As such, the word of God is only variable by His application to the times, not by men's doings, but according to His providence.
The KJV then, is just a spoke in the wheel of what God has determined should go forth--meaning, that in spite of whether or not it holds certain errors by men--it was perfect according to God. His strength is made perfect in weakness. So, does that mean that for the remainder of days, it should be considered perfect? Not at all. But the risk from there (or from any point in history), is that we veer off into the weeds of strong delusion. Which, is not only a possibility, but is a fact that was foretold to be.
The great misunderstanding here--and that error of strong delusion, is that when God began to change from His word being written on tablets, to being written on hearts--most have not--most have not likewise made the change. Which is to say--to even have this discussion...we most certainly are out in the weeds.