looking back through all the arcs, it's very apparent Kubo can't finish an arc well.
he either ended with a cliffhanger leading to the next arc or with a crappy ending.
-monster of the week era: ends with Rukia being taken prisoner and is a setup to start SS.
-SS arc: ends with the bad guys running away and taking an important item. last set of fights is Aizen wrecking some fools
-Arrancar arc: last fight was too rushed and left more questions than answers and was anticlimatic.
-fullbring arc: same deal as above but the final fight was lamer.
-Quincy arc: same deal as above but the final fight was lamer.
so, in hindsight, the series was always destined to end bad.
Whatever happened to Kon?
his last meaningful appearance was as a TV monitor.