Put it into an irrevocable trust of some sort and it couldn't become corporate fodder. Goodness knows Disney buys their ink by the barrel and could write the trust such that it's untouchable. You make it airtight to keep it out of anybody's hands for the future.
They cynic in me says that the pushback was what made them decide it wasn't feasible, though the tiny size of the island seemed to indicate it would be a dumb place to build anyway.
If for any reason it were feasible (Financially and Phyically) they would have continued development. I'm not as sure, as Phinz is, the push back would have made such a difference to them. They would throw their best PR spinners on it, IMHO.
Now I totally agree with Phinz their best PR could have been conserving the island turning into any number of local governmental environmental protection areas, international environmental protection areas, or simply work with the Bahamian government (with a nice donation) and putting into a protected deeded trust to a number of worldwide environmental organizations. There are many to choose from and aren't at the will of one government agency.
Yes that would mean I am in Neverland, because in my line of work I have seen many wetlands areas sold for development because of a so called trade to save land elsewhere, in the end that trade goes on depending on who is in charge at the time and which area they think is most important without any real scientific background. Development rights are sold and land that isn't necessarily a worthy conservation piece is conserved in lieu of the sensitive area. In the past 15 years or so it has gotten better and as more people become educated on the impacts of improperly designed development has on the environment (and ultimately us), the trend should continue for the better.
Sorry for the rant but topic hits a nerve in me.
Back to the topic at hand. 2 things could come of this trust. First the island would be protected and Disney looks like a hero (good for both) and second Disney wouldn't look so terrible when they test out their Plan B island (good only for Disney).
The sad truth is all lines (can substitute, businesses, corporations, governments) are looking to expand and grow and have the best, at any cost but, the good is that Disney did do testing. They will find the island they are looking for but, hopefully do the proper testing and EAF. That is the best I can hope for.