Building a decentralized indexed stablecoin out of individual single-currency stablecoins?

For all its centralization, the short-lived Libra project was interesting in one aspect to me:

It proposed a stablecoin that was a weighted index of several (fiat) currencies.

This idea was axed super quick (and embarrassingly so for Libra project) by fiat (Big) money. Boy were they ever shut down and scattered into the winds.

I think it's because their idea would

• offer a token that is immediately more "internationally palatable" than any individual component currency, and therefore incur less commercial friction that those - i.e. it could really take off in international commerce
• offer a harder-to-manipulate currency, something not very likeable from the point of view of the individual fiat currency players

With the recent upgrades to Bitcoin Cash, I am hopeful that our community might in future look into building such an indexed stable currency out of various algorithmic stablecoins.

(Think: an index of Moria USD, BCHBeStable EUR, BCHBeStable Rupee, BCHBeStable Yuan, etc.)

On a somewhat related note, wouldn't it be cool if we could distribute basic interaction apps on the blockchain that would run on standardized platforms (say, like a webapp) that would enable creation of apps that didn't have any formal owner, but that could pop into existence in a censorship-resistant way and be "discovered" just like the smart contracts that govern e.g. new algorithmic stablecoins.

That strikes me as "sufficiently decentralized".