The next obvious step would be for this large online retailer to hold on the Bitcoin that they new started accepting. Do they not have confidence in the Bitcoin currency?
From a finance perspective I do not agree with that statement
Long-term convergence of fiat currencies to a digital currency like Bitcoin would need to occur before that would ever happen.
Every large transaction for a physical item (short of the pre-2013) transactions like a pizza and such have been through a clearing house/exchange model. Even large entities like Gfty.com exchange bitcoins for fiat but are instantly locking in a rate with an exchange and converting the coins into cash.
Why? Because that's what pays the bills. Power companies, employee salaries ... all of the operational expenses are paid in fiat. So they are REQUIRED to convert to fiat to stay in business...
What you want is something that WILL take time to adapt and requires most of those necessity (power, water, trash, payroll etc) to accept and exchange in bitcoin, accepting it as a currency.
Until then....
We have to encourage the market that we WANT to SPEND our Bitcoins for GOODS. This will create a equilibrium of exchange for goods!