The alternative is not listing in those regions, not lowering prices for you
The alternative is marginally lower prices for the first world and higher prices for the third world as the prices become global instead of a massive grift which charges you based on how much money you're able to spend.
No, there's not even a theoretical possibility for that to happen. Lower priced regions are lower priced because there aren't a meaningful number of people in those regions able to pay first world prices.
Lowering the global revenue by whatever small amount those regions bring doesn't somehow incentivize publishers to lower revenue further by lowering prices in the first world. It makes no sense to think it does.
No, it won't. There's no point on the curve where low income regions have any possibility whatsoever of enough volume to affect it in any way. It's not a matter of "affording" anything, because adjusting to satisfy those regions is lower revenue than ignoring them.
It won't have a negligible impact on pricing. It will be literally zero.
I said it wouldn't be negligible. It would be literally zero.
The increased volume in lower income regions is massively less than the lowered revenue in the first world in every case. Regional pricing is "bonus" revenue from low income regions. It does not offset the first world in any way.