Locks, it will outpace private and the numbers tell us that already once public storage banking by states are online. Simply put, there are always going to be more people in that pool vs private.
If private caters to 4% then that leaves 96% displaced in public UCB. Correct? He could offer the public cord storage at a nominal fee above his private costs and probably do very well... remember we are talking 4.3M (total); so lets parse it out.