I have noticed no real discernible change in the glimmer pool this world, and I suspect that it is because caverns (in my personal experience) are largely detached from cave systems and need to be mined in to. This tiny hurdle might be enough to limit the amount of casual pickers that muck of the pool? Who knows.
I think I have had a glimmer in my study on multiple characters in multiple regions every day since day 3-4.


took a dip in to a cave before typing this out just to make a point
I think I can count the number of times I have been in a cavern and NOT gotten a glimmer on 1 hand