If you’re a regular internet user the Personal Data Storage paradigm won’t move your data from the cloud to your personal computer. Most people will still rely on an institutional cloud service, but instead of data-banking with a shareholder-controlled corporation people’s data can be entrusted to the equivalent of member-owned credit unions for data storage.
I think Drobo suffered from the problem of being slightly too technical for the technology dumb, and slightly too dumbed down for anybody who knows what Network Attached Storage is. Once you have the knowledge to know that you want network attached storage with redundant hardware, a generic RAID solution is within your ability level and there’s no point paying a giant premium for the Drobo branded version.