This is not the end this is just the beginning!
First of all bleach has to cover all of the story before it ends. All of the parts haven't fully been discussed yet.
Here are some:
(1) The Royal family(Zero squad): We have neither seen a single person from this squad nor the dimension has ever been opened. Only you can find mention of this dimension couple of times through out the story.. Aizen mentioned about it.. Obviously I'm very excited to see the soul reapers of this squad and their powers. lolzz.
(2) Ichigo's DAD: Ichigo's dad is a complete mystery. Who is he or what had he done to loose all his powers isn't fully clear. As it seems he was some big shot during his days and from what i think he was a part of this royal squad(not clear). How the hell did he meet ichigo's mother? Was ichigo's mother's death really an accident? How can ichigo be so powerful? What is his source of power and what did Aizen see in him? Aizen seemed to know alot.. Ichigo's dad is a very unpredictable guy that makes me wander about his true power!!
(3) Ichigo's power: Last time while defeating aizen ichigo's power remained for too short time. I was expecting to see some more action. although i see the reason if ichigo had that much power with the addition of hollow powers all along there would be no story. one thing i didn't get was the origin of hollow powers in ichigo. was someone in his family related to hollow??
As it's gonna be the last arc so it has to complete all these.. it will take quite a time. None the less 8 years. In this arc i'm assuming there will be at least 10-12 seasons.. Ichigo became this powerful in only arrancar arc. So don't think story's gonna end without seeing the ultimate power in ichigo..
So don't sadden yourself about the ending now and enjoy the show.. I bet you'll be able to show your kids the legendary ending..
Thanks Guys.. Keep posting