Well, besides damaging trust in DE, the value and role of platinum, the heirloom packs DO undermine the cosmetic market in two ways:
1) there have been a whole new cosmetic slot added that curently can only be used by buyers of these packs
2) these packs may be the beginning of new, 'progressive' pricing models for the cosmetics skins to come
I find that this is or threatens to be quite disruptive for the cosmetic part of the game.