I think this manga has gone on long enough, a lot of people do (as I can see by reading the comments) but I do have a theory why the poor author won't be ending this one very soon.
Like most of the manga dominating the scene (Pokemon, Naruto, Bleach, One Piece, too many to continue...) this one has been going on for YEARS. 10+ really. They've run for so long that stopping them would be like halting a moving train with your bare hands. It's difficult to end gracefully. (And no matter how much no one wants to admit it and barks about how it should end, ending it badly would only make us bark louder.)
Also, the manga industry -actually, the paper-based book industry as a whole- is going under. Nowadays, the future of manga relies almost solely on the backs of the big-boys (as I have dubbed them). It must be stressful and at times fairly boring to be writing the same story week after week for years on end. A good chunk of their lives has gone into this. Really, how many of us could keep people reading for over 10 years?
(Oh, and congrats to Tite Kubo for finally ending Bleach. Hope you go on to write other series but I really think you need a break >.< Take one.)
Anyway...back to my point (did I even have one besides ranting? >.>) Be kind to Aoyama-sensei. He's been writing this for almost 2 decades and that's worth a lot of credit. It'll end at some point, so we might as well go along for the ride 🙂