Also consider he's specifically appealing to makers of premium phones - you can bet Google and Samsung care a lot about scale. And to the parent's point about the iPhone 13 mini's sales still being more than all Pixels: ok, so then consider the already much smaller Pixel market share and how many people are left at the % of iPhone sales that the mini made up.
I'd love for this to happen, signed the petition, and will hope for the best, but I think even if there would be a decent market for this the big players don't care to make that bet.