Obligatory counter-reboot article.
Zasalamel and Tira appearing early doesn't change anything. It really doesn't. About Grøh, Azwel, and the Aval Organization, it remains to be seen. They're mysterious, to be sure, and we won't know what they're about until we play the story, but it is quite possible that both Grøh and Azwel meet tragic fates in this story, and don't influence the future at all, if that was their goal. And, to go back to December for a moment, the Aval Organization could still turn out to be the same society that Z.W.E.I. hails from, you never know.
SoulCalibur V's problems were rooted in that the game was incomplete, not in what it brought to the table. It's unfair to claim otherwise. We don't really know what the real reaction would have been to SoulCalibur V if it was as complete as SoulCalibur VI seems to be. It's not the timeline events of 1607 themselves that are to blame for being a problem, it's that it wasn't implemented well. Anyone would hate anything as incomplete as SoulCalibur V was, especially if it was replacing something you already knew and loved without adequately explaining itself.
Either way, I don't think we have to worry about this for a long time to come. SoulCalibur VII, continuing in SoulCalibur VI's footsteps, would likely cover the stories of SoulCalibur II, III, and IV. Then, if we're still on the path of success and the series is still going, SoulCalibur VIII would then possibly pick up and actually play out the events that happen after SoulCalibur IV, instead of timeskipping, or if it did timeskip, in a devil's advocacy perspective, it would still manage to do two things, sense permitting. It would explain and flesh out all of the new characters and give them full stories, and it would also not cut characters without explanations, or even perhaps not even cut characters in the first place.