Titanic was so far over budget and late - they were considering pulling the plug.. or the studio forcing edits on the film due to its length.. but Cameron put himself on the line to protect the film as he wanted to make it. Like Snow White - people did not believe the format and expense was going to accepted or successful - yet, like Walt, Cameron thought otherwise, and like Walt, created the most successful movie the world had seen up to that point.
Cameron, like Walt, is unrelenting in his vision of what the product should be, even if that means trashing what was already done. Their concept and their view of it is the only thing that matters. They were willing to bet it all - to see their vision to completion. Of course Cameron wasn't mortgaging his friends to get funding... but the tenacity and uncompromising direction, even in the face of commercial and financial scrutiny, is shared between them.