Eisner has never had that option...Not to say that had he that option he'd be capable of acting 'Walt like' but the fact is it would be much harder to be 'Walt like' in the running of such a huge public company. It's a bit like comparing apples and mice perhaps?
There's some truth to what you are saying, but its only a small piece of what's going on. For Eisner's first 10 years, he certainly did not have the power run the company at his whim.
Thankfully, there was Frank Wells, as well (pun intended) as other strong pre '84 executives. But for much of the last 10 years, Eisner has indeed had probably as large a level of control as anyone could ever hope to have.
If Walt had a fully loaded 6-shooter, Eisner had 5 rounds. He certainly couldn't be as autocratic as Walt could, but he's been close enough that if he really was trying to do Walt-like things, we'd all know it.
But sure, if he had been trying to implement his Walt-like visions, only to be sometimes stymied by the oppressive system, I could cut him some slack.
Its an interesting hypothetical, but given what we have come to learn about Eisner over the years, it really is nothing more than that... a hypothetical.