The region issue has been taken care of already. This isn't going to change. You could not link a POL account from one region to a SE account of another. But you can easily create a SE account for whatever region you want. The only catch is you have to use a payment method that is available in that region.

And your figure is super, hugely, massively ridiculously inflated. Europe, the place whiere this situation occured the most due to the game's late release there, does not represent anywhere near 50% of the playerbase. And there are plenty of european players with region-appropriate accounts. As a percentage, the number of people with wrong-region accounts is very low.