"One thing I haven't found, however, is one API that lets the skilled developer manipulate and search multiple APIs at once." There is one, it is called "the internet"
Yes, but HTML+JS+CSS has helped turn HTTP into an application environment, and not the content transport protocol it once was. REST is popular now, but it's not a real protocol. There's SOAP, but nobody really cares or wants to use it anymore. The web is undoubtedly missing a social content protocol. I predict one will gain popularity in the next couple of years. EDIT tldr: Until my blog has an open and commonly acce…
Do you know why? What makes you think we won't end up at
"There's OneAPItoRuleThemAll, but nobody really cares or wants to use it anymore."
or even at
"There's OneAPItoRuleThemAll, but nobody really cares or wants to use it."
If you cannot answer that, I wouldn't bother working on something like this.
Also, who do you think will be interested in having a common protocol? I think the answer will be "those with little data of their own". Big players do not want you to build tools that work together with 'their' data (clear example: Twitter: open while small, but now closing down its API)