RL: you are correct in that TR-069 is basically SNMP on steroids and is used as the standard remote monitoring and management protocol type for WiMAX/LTE-based networks.
However, these WiMAX/LTE devices do not support SNMP by the nature of their respective technology profiles - so my ultimate question would be is if my NPM would still be able to monitor these devices in terms of telling me their status (up/down/failing) and the statistics of their connection (throughput/RSSI/modulation/etc.) - you know, all the things that are normally monitored through SNMP?