This is a completely uninformed opinion. Sea World was in big trouble long before Manby became CEO, they were actually in trouble long before Blackfish came out. Of course the movie made things worse but they would likely still be struggling even if the movie didn't exist. Jim Atchison was a terrible CEO that made lots of head scratcher movies and doesn't get enough of the blame for mismanaging the company for so many years. Just think of all the $ wasted just in Florida over the past 5 years: Antartica - $ 70 million for a ride nobody likes. Falcon's Fury - Blackfish was becoming popular, the company was losing gobs of money, and instead of building something reliable Jim Atchison decides to build an INTAMIN PROTOTYPE and then they advertise the hell out of a May 1st opening. It missed the whole summer (what a shocker). Sea World isn't Disney they can't just write these off and be OK, Sea World isn't owned by AB anymore that kind of money is a big deal.
Also Manby pretty much had to end the whale thing as the company has no money to fight the litigation (remember it's illegal to breed whales in California now) which would be a long and extremely expensive process. All the money they have they need to re-invest to somehow try and get people back in the parks. Also Jim Atchison's "Blue World" thing was super expensive and wouldnt have brought anyone to the park, it wouldve been a gigantic waste of money and Manby knew that.
Sea World is in big trouble. It seems like in the past 10 years or so everything bad that can happen to them has happened. From the time AB was bought out this company's problems started snowballing and the South American economy falling apart is just the latest.