New sources of quasi-random data are interesting. But if one must go to such great lengths to gather that data, its value in a one time encryption process has to be questioned. This is especially true given the fragility of the data source.
When dealing with sensitive information it can’t be stressed how important it is to clean up after you are done with the information. Stories about machines unintentionally keeping too much data serve to remind us of how important it can be to be vigilant about cleaning up and keeping only what you absolutely need.