To be fair, Chapin is a fucking moron. A few of the very loudest, most obnoxious people were bitching about the fact that Siege Rhino just got slammed into Pod, and so Pod got the axe for the "design space" argument they occasionally drag out and ritualistically beat with shit like SFM. Nobody was bitching about Twin. The deck wasn't dominating, it didn't break the rules, and the ban came seemingly out of fucking nowhere. Anyone who didn't have their nose firmly planted in WotC's collective ass was left wondering what the hell Wizards was thinking, because the Twin ban doesn't make blue better.
Eldrazi, on the other hand? People have been muttering about this here and there since OGW got spoiled. There was a general realization, especially among older players and pros, that we already kinda had two Sol lands for that deck already, and that Legacy-style Eldrazi Stompy was going to be a thing. Even a few people on cardsellers' payrolls questioned whether the decision was intended to let Eldrazi flourish at the PT.
6/8-ing the Top 8 is only causing people to bandwagon behind something the smart players already knew: letting Eldrazi have 8 sol lands and then printing cheaper, more efficient Eldrazi was a horrible decision.