That would be part of it I'm pretty sure...if they can't get the order filled, the rebate does not come anyway, so they may be farther ahead to give up the rebate and get the order filled and the $14.95 SC and what ever % they negotiate with the filling florist.
The wires ARE going to be gone, and I would bet in less than 5 years, but the coN's will be around still gathering and unless they build their own filling network, they will have no place to send the orders.