I can't quit Ken in SFV. I keep trying, but he's got such wonderful visual flair, great key frames, and giving him a flexible command run gives him a nice niche to keep him distinct and uniquely fun from the rest of the Shoryuken Army.
I appreciate Ryu a whole lot (Especially on the tail end of D.E.), but I miss Ken's explosive momentum too much when I'm not playing him to make the change permanent. Things can definitely change when SF6 comes around, but with how stable Ken's been from patch-to-patch and how happy they seem to be with Ken in SFV, I don't expect them to stray too far from this direction.
/the real dread here is seeing if they're going to go with Langdon again, since SF6 will be their first opportunity to break free from using him for voice work in a major character since Langdon started really showing his ass on Twitter.