Well, nerds are passionate about their hobbies. This happened during DoA5 as well when they said they were going to do the same thing (though they backpedaled back then).
Well, that petition did have 750 votes the one time I saw it (maybe there were more than one?), but it doesn't really work as a good marker anyways, I'd argue. You see, those are activists who want the game to be changed (against the creator's visions). In my view that's a pretty scumbag move, as it hurt artistic freedom by attempting to apply pressure from the outside against a product not even released. The "correct" way to go about it, in my view, is that If I don't enjoy the changes of Koei Tecmo (to a larger degree) I'd just not buy the game (alternative jump ship by not getting DLC/expansions). I wouldn't dedicate my time and effort into signing petitions and trying to change the makers decisions. It's their game, and they make changes as they see fit from their artistic visions, just like it's my freedom not to buy it. The time for you to voice your opinion is in the marketplace, not in a way of "If I don't like it, then nobody should have it!". I also believe the waste majority of those who would get turned off by such changes would take that approach rather than going on a crusade to get it altered. I mean, just buy Soul Calibur 6 instead if jiggly physics is so important to you (or Senran Kagura if you want to go all out). If a potential niche will become open when DoA alter their focus, then somebody will fill that gap. This is why the free market is the ultimate democracy where the loudest voices doesn't cancel out the wants of the people.
Anyways, to bring it back to the topic. Even if I admittedly would like to have options regarding boob sliders or jiggly physics (I'm always positive towards free choice no matter what), I'll survive without it. I also hope they implement optional gore functions if there's a lot of blood. I always turned it off when I played Dragon Age, as the Mortal Kombat feel isn't really my cup of tea. The Injustice wounds where you could see the muscle cells under the skin from injury also wasn't something I particularity liked, and would like the options to turn off. Regarding of how intense those things gets (within the options to select) matters way more to me than the size of the women's bosoms. On the other side, the Mortal Kombat crew really enjoy that stuff, and maybe it would be wiser of them to attract that audience by going more towards hardcore fatalities while leaving my preferences behind. Basically sales matter more than what some few individuals believe very strongly, the question is if it's worth the change if they already have a stable fan base and niche well secured, and won't be able to penetrate those new markets as those wants and needs are already viewed as fulfilled at a higher level by other fighting games (my bias here is that I don't want them to become Mortal Kombat/Injustice, as I dislike those games despite it being fairly popular, just for your information).