xDSL in a BR1 cellular router

Is there any interest in making a BR1 with a built in xDSL/VDSL/etc modem in it so we can have a single device that can fail over from fixed line to cellular?
The Cisco 887 is going end of life and I am getting a few requests for a Peplink alternative.
Also I have a very large ISP interested in a single device to manage this.