In reply to Nate.

The current timeline is through the remainder of 2021 for the Classic Editor plugin. At that point, the team will reevaluate based on usage. Given its current active install count, I imagine that they will extend that date.

It's also important to note that if/when official support drops, it doesn't necessarily mean that the classic experience will disappear altogether. It could mean that the classic editor code is removed from core WordPress and ported entirely into the official plugin. We really don't know what it will look like at that time yet. There really isn't a big (or even a small) push to remove classic support right now.