Except that had Eisner really gotten his way in the beginning, there would likely not be a WDW today as we know it. His plan (when he first came to the studio) was to sell EPCOT Center to raise capital to make mainstream Hollywood movies. Disney would have leased back parts of the park to run, the rest would have been leased out to who ever wanted to rent space. Fortuently, better business people found a better plan (limited partnerships like Touchstone, Touchstone and Silverwood) and EPCOT was saved.
While Eisner did promote a few good ideas - they often ended with massive problems. His idea to turn WDW into a upscale luxury brand lead to the over development of the deluxe resorts. His desire to get "the right kind of people to WDW" created the Disney Institute fiasco. His "beat the Universal guys at all costs" lead to the truncated Disney/MGM Studios park and abandoned film production studio. His unwillingness to spend on resort infrastructure have left WDW's roads clogged with busses and its lakes too polluted to swim in. It literally took the efforts of thousands of people to straighten out the demadns of this man's ego - better management would have allowed for even more and better growth without the downsides we see today. The real reason behind WDW was to show people how things can be done right. That's hardly the case today.
And there's Eisner real legacy - he sold off 1/3 of WDW. Disney has walked away from all the land roughly south of US 192. After setting up Celebration (because Disney demanded a qucik return on the land but couldn't come up with a resort/vacation concept for the area), Disney sold both the town and the undeveloped land to raise cash. The area has even been removed from the Reedy Creek Improvement District.
So whatever Eisner did yesterday to build WDW, he sold off its future.