Hmm.
The whole idea works for me as a whole, but there's another aspect that applies to us RPers.
What is Aurum? IC-wise, it sounds as though we are transferring spacecash (ISK) into dirtcash (AUR). One would expect such a transaction to incur a hefty transfer fee.
In a way, I'm glad we won't be paying direct ISK. It's pretty immersion-breaking to try to think that your shoes cost as much as a mile-long piece of military hardware. Now, this will not be the case. A plex may cost a lot, sure, but you're transferring it to a planet-based currency, the taking a sliver of that sum and buying something nice.
Plex, to me, always seemed to be the IC/OOC divide made manifest. Now, our ISK will be paid IC, vanish to the other side of the 'wall', and come back as something IC, that doesn't seem retarded. It's not perfect, but it's a lot better than what it could have been.