The NBA already uses it on an experimental basis in the All-Star Game and in the G League.
In the All-Star Game, the fourth quarter is completely untimed and the target score is the leading team's score plus 24 (chosen to honor Kobe Bryant).
In the G League, overtime is untimed and the first team to score 7 or more points wins.
Also, the CEBL (the Canadian league that Treveon Graham plays in) also uses the Elam Ending under the same rules as the TBT, but the target score is the leading team's score plus 9.