Well, yeah. Their tournament attendance didn't suffer, ergo, nothing was wrong.
It did start suffering after that. Not at the big events, but attendance at smaller events, FNM's and the like went downhill fast.
As for MaRo's second twitter post above, about being beyond killing now...
I'd agree that we're nearly beyond the point where a
single mistake could kill Magic (and it's now so old and established that it will have a life beyond WotC, no matter what happens), but that poor aggregate decisions over time can do serious damage.
For instance, I took our list elsewhere and built it up to this:
1) The "demented sex-cult culture in Wizards until 1995" (personally, I refer to that period as the time when WotC was still "run by gamers")
2) Black Summer (or Necro Summer)
3) Combo Winter (Urza's Saga fiasco)
4) Affinity
5) Caw-Blade
6) CoK Block's inbred and generally horrible execution
7) The overall long post-Ravnica decline due a long run of lackluster blocks (you can argue that maybe this is mostly just 4 & 6)
8) Jund
9) Fae (arguably Jund and Fae also set up Caw Blade, because Wizards got more used to one "good deck" dominating Standard)
10) Cutting States events