Accept Credit Card payments for bitcoins.
The buyer would get their bitcoins at the price at the time of purchase, but they could not spend them until 6 months have passed (the time needed to avoid chargebacks).
Why would anyone use a credit card today to receive bitcoins in 6 months time?
Newbs that want to easily get into Bitcoin for the first time just so they can say they have some bitcoins.
Or investors that see the price drop but do not have liquid cash in a place where they can take advantage of the good deal.
Remember, CoinBase does not allow you to spend for 1 month after your first purchase.