I can understand your point of view, but I also disagree with it. I did not become interested in aviation from reading aviation books (and I read plenty of them) and watching TV shows growing up. I became interested in it because my dad took me to airshows and plane spotting at airports. I didn't become interested in science from reading books about physics, etc. I became interested from building and launching model rockets, remote control airplanes, doing chemistry experiments, etc. There is no argument that can be made against seeing things in person, being close, and even better direct physical contact. That type of connection cannot be made, not even close, through a television or on paper.
SeaWorld provides that type of direct connection with orcas, dolphins, sharks, etc. that many people would never otherwise have the opportunity to get. I agree that there are those that are there for the sheer entertainment of it - heck, I'm entertained when I go. But there are those (myself included) that are utterly fascinated by it on a level far above sheer entertainment. You cannot deny that the experience that some (if not many) people get at SeaWorld has an incredible and tangible positive benefit.
The experiences I got growing up from direct connection to science and nature made me interested in medicine, and I now routinely care for patients ranging from 23 weeks gestational age to the elderly in intensive care units. Taking away access to experiences such as those that SeaWorld provides will have a detrimental effect on our society, I have no doubt about it. Needless to say, I am disappointed in the announcement and hope that it will soon be reversed. In the meantime, I am glad I can take my boys there and see them before they're gone, if it reaches that point. I was able to take my oldest there this past summer and seeing his reaction was priceless - I couldn't help but imagine the completely innocent fascination, wonder, and awe he felt there.