Few people (Ron Paul supporters aside) seem to have issues with the financial cloud. But I bet consumers will have problems giving up their data.
Perhaps it's the personal nature of the stuff: family photos, letters, work things. They're labeled with something approximating natural language. In the analog world, these are the things that got stored in shoeboxes on shelves, or manila folders in file cabinets. I don't think people fully realize that the digital versions have been obliterated, and then transformed into binary codes that are stored as the ghost remnants of an electron haze.
"Photos" are "on the computer." And if you're going to try to explain to me why that's not necessarily accurate, you might as well tell me something really crazy, like how time can slow down if you go fast, or something.
Cloud computing is coming, but it's going to take more than availability (or simplicity, ubiquity, or even low cost) to get the rank-and-file consumer to leap into it. You might think it's a no-brainer, but I'm thinking it's going to raise a whole lot of questions for regular folks.
Maybe drawing the parallels to how we handle/store money will help? All of us already use the $Drive.