The NFL have just passed a new kick off rule to increase the number of kick returns and minimise big impact collisions. Given the NRL's desire to mitigate the effects of big impacts and improve player welfare, I strongly suspect we may see a similar rule change in the NRL. It may be as follows -
Team A has one player kicking off at the half way line. The rest of that team is lined up behind Team B's 30m line.
Team B has all players lined up behind their 20m line.
Team A players cannot move forward until a team B player has touched the ball from the kick-off.
Should team A fail to kick-off past Team B's 20m line, play would restart with a tap kick from the half-way line.
Team A has one player kicking off at the half way line. The rest of that team is lined up behind Team B's 30m line.
Team B has all players lined up behind their 20m line.
Team A players cannot move forward until a team B player has touched the ball from the kick-off.
Should team A fail to kick-off past Team B's 20m line, play would restart with a tap kick from the half-way line.