It's also a question of support. As you're well aware, we have a ton of about:config flags that, if fiddled, will absolutely break various things. So the question is - how much do we want to support the disabled stream case? If we reach a point where we really _don't_ want to support that case, then the polyfill is probably at the point where it can be dropped. If that point is now, we can probably drop it now.
Bug 1521413 Comment 6 Edit History
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It's also a question of support. As we're all well aware, we have a ton of about:config flags that, if fiddled, will absolutely break various things. So the question is - how much do we want to support the disabled stream case? If we reach a point where we really _don't_ want to support that case, then the polyfill is probably at the point where it can be dropped. If that point is now, we can probably drop it now.