No, it is not currently planned for the upcoming 2019.10 release. As @Nicholas_Bokulich said, this is very low priority for us at the moment. Regarding the "workshop" example --- we teach QIIME 2 workshops very often, and don't see this being an issue with the tutorial datasets we use. In fact, the small bit of variability between different runs is a useful talking point for emphasizing what rarefaction is!
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