If this new MV movie spark a new series, a good plot would also be the revived Lao Li organization. Imagine the now older Castillo training one particular young Vice cop in the way of the Bushido. He'd be a vital asset to the team in battling this dangerous group.
With talks of a new MV movie, they'd do better off with a sequel and not a reboot. Imagine the revived Calderone Cartel headed by Emilio Calderone, who's really Ricardo Tubbs Jr. Taken away by his uncle Orlando, Ricardo was raised in a Cartel home by Maŕia, who changed his name to Emilio.