Sprint WiMax being discontinued and Epic 4G Touch

With Sprint dropping over 60,000 customers from WiMax in November who have phones using it such as the Epic 4G touch, Is it possible to do a custom ROM that will allow the Epic 4G Touch to work on the newer Spark network/4G LTE, or do I use my Epic for a paperweight.
The Epic will continue to work on 3G but Id rather buy a new phone than go backwards with speed.

Anyone have a solution? :crying:
thanks
qanda