I agree. Already nearing Aizen's defeat, Kubo used too many plot twists, so much to the point that all new developments became too predictable. The parts throughout the series that weren't predictable are where he pulls off a deus ex machina, which he does frequently. These gimmicks worked for him best at the beginning of the series, but have since gotten old, and yet Kubo continues to use them post-Aizen's defeat 400+ chapters later.
After over 4 years of Bleach fandom, I'm feeling my interest in the series waning hard. To continue reading an extremely popular series, I might revert to reading One Piece and/or back to Naruto. From what I've heard, while Oda seems to have planned well through 600+ chapters, Kubo claims he doesn't even have an end in mind. I think this is what separates the great series from the legendary ones.
With all that in mind, I can't see Enigma surviving only on a continuous string of plot twists. Soon, I think the plot structure is going to have to change drastically for the series to work out, or else get cancelled. I hope Sakaki's past experience as an assistant to Reborn author Amano pulls her through.