This is one of those decisions that will not solve preexisting problems but rather create bigger ones to be solved, as always, with less-than-optimal measures, to say it kindly.
In a Pokemon game where there is no real post-game (stuff not yet implemented, like most of the Battle Frontier) and people just go around grinding, some of the most important items get just straightly killed. So yeah, it is that massive, because sooner or later people will realize that there is no further reason to keep playing an MMO where you have absolutely nothing more to do compared to any other game, an MMO where all you can do is grinding and you get stripped of what you got every single time.
And by the way, messing with the Amulet Coin was really mean, especially since it hits harder players who started playing more recently, and realized that without the (still poor) help of the amulet coin, one cannot even afford pokeballs once reached the next town. In a Pokemon game!