What happens if a power of attorney resigns and all other agents listed do not want to serve in the role either?

My aunt is very difficult to deal with and has some psychological issues as well as a very bad attitude. She is making life hard for me and my family. She is in assisted living and will eventually be on medicaid. I am currently still trying to assist her to the best of my ability. My wife is secondary POA and my mother third. Neither of them are willing to take over. My wife can't stand her for obvious reasons and my mother is in ill health herself and does not get along with her that well. I spend a lot of my time taking care of my aging mother already, but she is agreeable and easy to work with. I may be taking a job in another state at some point as well. There is no other family close by.