The "cloud" is still ultimately hardware. And it'd be much nicer if a good chunk of that hardware is light enough to be carried around in my pocket so I don't have to deal with network outages or latency issues, and instead have it form it's own little mini-cloud with nearby devices combined with synchronizing to more remote large scale cloud services to safe keep my data.
That's already sort of here: My data exists with external providers but is nearly all backed up to my home server, which serves my set top box, and serves as a backup point for my phone and laptop (before shuffling the data on to external backup), and my phone can tell my home server to push a movie to my TV via my set top box using DLNA, or my laptop can push it to my phone. Or my phone to my TV. Or any of them can pull it straight from the file server.
No "hardware integration" necessary other than the networking and power supply.
That's already sort of here: My data exists with external providers but is nearly all backed up to my home server, which serves my set top box, and serves as a backup point for my phone and laptop (before shuffling the data on to external backup), and my phone can tell my home server to push a movie to my TV via my set top box using DLNA, or my laptop can push it to my phone. Or my phone to my TV. Or any of them can pull it straight from the file server.
No "hardware integration" necessary other than the networking and power supply.