In "Dog Show Afternoon", June was about to leave for vacation and her family was going to depart by plane. Then at the end of the episode, we learn that Juniper physically cannot leave Orchid Bay due to her status as the Te Xuan Ze, with an impenetrable force field preventing her from leaving at all. Had the Bombat never gotten released, June most likely would've left for that trip and would've met a very unfortunate end once the plane passed the force field...
As at least one fanfic has pointed out, Monroe has zero sympathy for June's desire to have a normal life and the fact that Dennis turns out to be magically gifted probably will not help his opinion of her choice. How badly could June be messed up if Monroe turned out to be a Bitch in Sheep's Clothing who convinces June that her beloved Ah-Mah thinks her life is worth less than her duty?
The magical elders are good at empowering individual to be the Te Xuan Ze, but it's made apparent that they can't take the power back as seen with Kai Yee who had to be imprisoned twice. Consider the barrier that keeps the Te Xuan Ze trapped in Orchid Bay City: said to make sure the world would always be protected by one of a June's family, but maybe also has the side effect of keeping a rogue Te Xuan Ze contained in the worst case scenario?