I'm not sure whether or not Kubo intended to originally continue Bleach beyond the Aizen saga, but he did say that he wanted Bleach to last 10 years about 4 years back. I'm guessing his publishers/editors wanted him to continue Bleach after the Aizen saga because of its still rather good ratings, but the ratings started falling by a lot when the anime ended (In the end, Animes are essentially marketting for the main manga), and thus they made him rush through it. This arc had its moments (Everything but the Rain, the Quincy's prologue fights, etc) and I feel like it's good overall, but it's a shame that the manga I've been reading since 2009 is going to have a rushed ending...