Well I bought the Japanese version instead and plenty of other people seem pretty turned off by the lack of a dub. Whether that really amounts to much I can't say but I certainly don't think it's going to sell more copies to soccer moms or whoever else these changes are supposed to appeal to. I mean taken at face-value this game would be a slam dunk day 1 purchase for me due to the development team, the visuals, music, combat, setting, themes, etc but now it ended up being a used import purchase instead.
How many fence sitters who aren't being directly targeted by this game's incredibly specific nature are going to jump on because they no longer have to worry about girls showing some skin? That seems fairly low on the list of things that are going to turn off a general audience when it comes to this particular title. They earn some brownie points from twitter so I guess that's worth enough for them.
I guess I just don't see how much of a real impact it would cause. You had a fair few people opting to import the Japanese version of Fates in retaliation over those changes it had, and the game still wound up clobbering the crap out of Awakening sales-wise. Xenoblade X also appeared to do quite well for itself, too.
Fatal Frame 5 is probably a harder situation to quantify because of the release strategy, but I doubt it sold any worse a result of costume replacements than the eShop-only release in NA would have already done. I'm not trying to belittle you or anyone else taking a stand against anything like this, but it does feel like a tempest in a teacup in the grand scheme of things.