It will not matter much if Momo dies, she is just a minor character in the story.
First of all, the mangaka should remove the butterfly-wing effect, show somethings' that are awesome which came to because of the Hogyouku implantaion in Aizen. What did he get by implanting the Hogyouku in himself? More power, longer hair, clothes of a priest and wings?
What tha Fudge is that, does such a powerful thing provide these things as bonuses?
Even if Gin had or has to die, I would've wanted to see him in his Arrancar mode, if he had one.
Oh and Yamamoto should just die, keeping and old man the commander of such an advanced society sucks. Rarely does he get off his seat.
I want more cool things to invade Bleach, like in Gundam they keep upgrading the Mechas' to help them in..... taking control of the world...not really, to help them in fights.