pdvWireless (the company that built out TeamConnect) has sold the customer base over to Goosetown and A Beep but still operates the core radio infrastructure (see pdvWireless Transfers MOTOTRBO Customers, Cuts 30% of Staff). Customers in Dallas and Houston specifically were sold to A Beep. A Beep also operates a nationwide Push-to-talk over LTE service called "Digi-Talk", and if I was to render a guess, they may be transitioning customers over to that platform.
Of course Push to Talk over LTE is the end of being able to monitor those users on a scanner.
This 900MHz rebanding would also be impactful to the railroads and other services that exist in that band. On the upside, it might seal the fate of 3 of the 4 remaining OpenSky systems in Texas, as United Airlines might move their Houston OpenSky users over to their nationwide Connect Plus system, LCRA is already moving off their OpenSky to P25, and DART might jump to their P25 system (although only the Simulcast site would be affected so that might be wishful thinking). Oncor is also switching out their EDACS system in 900MHz, so they might avoid being impacted as well.