I wouldn't mind seeing a more powerful slightly evil Yoshi in T7! That's my impression from this ending. The evil energy overtook the Fumaken and his original sword absorbed the evil and the power fused with Yoshimitsu, so he and his evil soul hungry sword are now one. Forcing Yoshimitsu to kill for his own survival, He must do wrong to make it right!
I think it would be totally fucking badass if Yoshimitsu went bat shit crazy in Tekken 7 while also being aware that he could free himself from the confines of the Fumaken/"Yoshimitsu" Sword. Kinda like Darth Vader turning at the end of Empire, just without heavy breathing.
Think about that idea for a second....
Possibly, he could destroy Alisa Boskonovitch into pieces (Because she sucks and is goddamned cheap, E.G. the epitome of Scrubs online), nearly kill Bryan Fury in a.... bloody fury, massacre his entire Clan (Except for Kunimitsu.... she survives and enters Iron Fist 7 to enact revenge.... Wink, Wink) and realize that wrongdoing at the last second, and also turn on Xiaoyu, who he once saved. Lots of material could be made from this.
How badass is a posessed, Power Hungry and Evil Space Ninja Cyborg??
I think it would be too irresistibly exciting to have Yoshimitsu turn from his ever-righteous ways into a possessed, evil badass. Sexy. :wink
I actually think it would be a great chance for them to get more depth into Xiaoyu's character. I mean, she's been trying to get through to Jin forever now, and that hasn't worked out very well at all. She owes Yoshimitsu her life, so I think it would only be natural for her- if Yoshimitu ends up being a "bad guy" in Tekken 7- to try to save him from evil.
As for me, I'd like Yoshi to keep up this new "dark" style. He's positively creepy now, and despite my initial suspicions, he's not too complicated for me to handle, at least to some extent. I'm still gonna keep Bryan as my primary character, but he pales in comparison to this new, kick-@rse Yoshimitsu, shotgun or no shotgun!
I'd like to see a somewhat good-Yoshi / bad-Yoshi struggle in Tekken 7 as well, with of course good Yoshimitsu prevailing, with or without Xiaoyu's help. Or perhaps it would take "an old aquintance" to snap him back to himself...? I can always hope.