I can not prove with absolute certainty that the decrease in the hashrate of Antpool was because of this incident. However since I tend to keep an eye on pool distribution I do distinctly remember Antpool having over thirty percent of the hashpower before the time of this incident and now they only have sixteen percent. One aspect of that has been the recent increase in the overall hashpower since I am looking at the percentage not the hashrate. I do share your concerns about mining centralization, however I do not think that increasing the blocksize would effect mining centralization for the reasons I have explained here. That is a good website by the way, thank you for linking it, there is some very good analysis on there.
My new Antminer S7 came preconfigured to mine on Antpool. As soon as I powered up the machine I saw that it was busy hashing and blowing hot air. It took me a few seconds to figure out that it was stealing my electricity for Bitmain's benefit. Because of the SPV mining incident, Antpool is the last pool I would consider using, so I immediately shut the machine down until I could figure out how to set it up without it supporting a pool that remains in my "bad" book and will remain so, unless or until they give me good reason to believe otherwise.
