Yeah I know about the third route, but as I said they probably figured they needed to break off from doing just the original FSN (assuming they're going to do Heaven's Feel at all of course), hence why we have Fate/Zero first.
And yeah, I did figure that big FSN fans like you guys would only say that because you hated the Tsukihime anime.
While the Tsukihime anime may not have lived up to the expectations of its good base product, there are lots of anime-made-from-games series-es that fall to this and don't get remakes. (though a good number of those supposed failures aren't as bad as the haters say) I personally found Tsukihime to be okay.
Still, they haven't touched it in almost 9 yeas, aside from Carnival Phantasm. I doubt they're going to start it up not of all times. The FSN anime was popular, hence why they continued to make more.