the gut microbiota changes fairly rapidly
This runs contrary to what I've ready, but not specifically on gluten-related microbiota. Apparently change in the overall ecology of gut microbes can be very difficult to recover from.
Here is some data on the ease of changing one's microbiota. However you have a valid point in that the persistence of particular kinds of microbiota is not well understood and evidently it's possible to fall into, um, local minima that are hard to get out of (thus the whole fecal transplant business).
I suspect the reality here is much more complicated than the simple "easy to change"/"hard to change" approach.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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