Bad assumption there, Aragon companies will be able to handle tokenized fiat (USD, EUR, etc). Santander is working on a stable coin project to tokenize EUR and USD http://www.coindesk.com/santander-vies-become-first-bank-iss...
Aragon is creating a framework (as an open source project) for running Blockchain companies. We don't provide legal advice nor services, we don't take any responsibility for a hypothetic bad usage of our software.
You cannot perfectly link a real world item to a digital asset without losing the 'trust-free' nature of cryptocoins. You always end up having to trust someone. And once you do that, you've lost all of the advantages of the digital asset.
[1] - https://en.wikipedia.org/wiki/List_of_cryptocurrencies
If you own 1 EthUSD, there is a warranty that someone will give you 1 USD for that token