I think you have two groups of people.
1. The diehard PETA people that most of the general population thinks is crazy and has taken animal rights too far because they do stupid things
2. The general person who cares about animals that was offended by Sea World after the movie came out.
The first group will never be happy until Sea World and all parks like it including zoos are closed. SO this expansion will not sway their opinion of Sea World and won't really make them ever go to Sea World.
The second group will forgot about this in a couple years and when this opens up will go, oh look they did something, and will visit Sea World again.
It is that second group that made this such a PR mess, because that is a much broader group of people and why it probably in some ways hurt attendance at Sea World. That second group is also the reason why I feel no major US company would touch Sea World until this blows over.