The ACCC will have little to say on this matter for multiple reasons.

The first reason is because eBay aren't eliminating non-electronic payment methods. Sellers will still be able to receive bank deposit (not facilitated through eBay's managed payments system) cash on pick up (impossible to facilitate through managed payments) and presumably other non-electronic payment methods too, though I doubt they are used much these days, if at all (COD, cheque, money order).

The second reason was that the ACCC's previous decision was based - in part - on consumer choice. Having sellers only being able to offer and receive PayPal payments reduced consumer choice. eBay's managed payments system only increases choice of payment methods available to buyers.

The third and final reason why I know the ACCC will have nothing to say is because similar systems to eBay's managed payments already exist in Australia, some without the option for buyers to pay through non-electronic means - just look at the limited payment options available to buyers on Amaz*n Australia, and the fact that they also manage payments for sellers, which are periodically paid into a nominated bank account, but without the flexibility of being able to choose daily payments.