While there are both points for and against Taki's status as the "Chun Li" of Soulcalibur, Chun Li is probably the most like Taki from a personality standpoint and iconic standpoint and that is what we are most referring to. Involvement with the story be damned, Taki was highly involved in the first game, and honestly, after SCII the story became complete shit anyway.
With that said, is is in no way a good thing to have her replaced. To just throw another model in there and slap her moveset on it is literally a slap in the face to devout fans. Taki is one of the very few characters to have never been 'cloned', such a shame to betray that legacy now. The character in question can simply not be Taki from a body type alone, so it's new or unrelated entirely.
As for how well this game sells? I've done my bid for king and country here. DeathCom.NET has been a strong supporter of the series for the past ten years. I have been an active voice in the community. I don't even know how many times I've debated character design regarding Taki in other forums on other topics (often creating new fans).
Removing Taki is more than just removing a character. It's principle of the matter. This will boil down to a war on Namco regarding sexist behavior plain and simple. This is a war I really wish to avoid. (and yes, I know it's also a war I can not win, but I WILL do damage) Considering Mitsurugi, who is confirmed for SCV, and then Taki gets ditched? The only real reason this would happen is Taki is female, and would be over the age of 40. As we know, women in Japan over 40 are taken over a hillside, and apparently shot. I was really hoping Project Soul would not be so misguided, even if they have to bust out the magic whatever to keep her forever young. Sure its cheating, but that whatever scenario I can deal with.(besides, that gives her a way into Tekken at some point :P )
Would I take it personally if Taki is to be removed? Hell yes. When I started playing this game I was 16 years old. In the time since I've not only become older than my favorite character, but I've also beaten opponents with a character I was playing before they were even BORN. So for them to simply remove her because she is just too old? Well you know what, I guess I'm too old for this shit too then. Time to grow up and let the legend die.
I really hope it doesn't come to that. And I still refuse to believe that Taki will not be in this game. But mark my words, as much as I've been pro Soulcalibur in the past, it will equal as to what I will be anti Soulcalibur should such a dark future come to be.