I already see my local dairy industry make money out of this: "Drink our new Brainimel, with the best microbiome for your brain, so you can stay asleep, obey and consume..."
I once had the horror of walking through some drug store and seeing bottled DNA, with a description like "an essential component of life!" At best, I suppose it was an overpriced and inefficient amino acid supplement. At worst, it was effectively a sugar pill.
I'm sure that these studies get any traction, we'll see bacterial 'supplements' almost immediately. Never mind that even gut microbiome supplements are usually destroyed in the stomach, we can definitely make yogurt that gets to your brain!
