Google doing that doesn't surprise me at all. As for the impact of the button removal, I don't see any consistent changes or trends across the GBPs under management. I have those constantly growing the number of calls originated at the GBP, and those that are declining, as well as a few that are just randomly all over the place. Strategically speaking, the presence or absence of the call button or any other feature, shouldn't be a concern, as long as it's across the board. If every listing has the button or no listing has it -- it's a realm of the Google's UX/UI. When only few listings have it and others don't -- that's a competitive advantage impacting my business and I'm paying attention. Or paying money to have this button, or a bow, or a larger font, or wider dimensions etc. And this game we all know well :-)