Feathercoin realizes it's gonna fail and pivots. I'll go with Datacoin, which had this goal from the start and whose design is better suited for this purpose.
Bitcoin should absolutely not implement this. Blockchain bloat is already a problem.
Namecoin will beat datacoin. Any alt that serves a different purpose than bitcoin, and the purpose isn't to use a different hash, should always use double sha256 and 10 minute blocks so that it can feed off of the main network's (bitcoin's) computing power via merged mining. There's just no reason to force people to devote computing power to one or the other when they can devote their power to *both* with minimal cost. That fact, along with first-in brand recognition means Namecoin is, and rightfully should be, the rightful "datacoin".
If the purpose is decentralization and disruption and uncounterfeitable storage, feeding off of the biggest computing network should be part of the design.
