that "better secured cloud" in more detail...
Perhaps the killer app for IPv6 is an appliance (quite possibly built into the domestic router) that lets you run your own cloud. You do the backups. You determine the privacy policy. No-one turns round a couple of years later and says "all your stuff belongs to us next month unless you find (and migrate to) a new provider".
It needn't be expensive. You need a disc large to store your crap on, something large enough to backup to, and a router capable of taking the "load" of your immediate family and friends all rushing for the baby video at once. An off-the shelf router with a couple of SD cards would probably be sufficient for most households. The only problem is installing, configuring and maintaining the software stack.