CHOUFLEUR

no, you shouldn't be worried.
people drop out of phd programs across all academic disciplines all the time. and everytime someone does, the cause for the dropout certainly should not be automatically attributed to the POI.

It sounds like they all like you which is a good sign, especially that the professor called you to tell you this. Sometimes they might not give you a guaranteed admission because of funding or that the department might have to allocate spots between professors and some are more prioritized than others. I would say overall you have a good chance but it's not guaranteed. 

Here's my opinion: My advisor recommended that I not contact my POI after the initial response to their waitlist email.  Some POIs perceive it as pushy (and could cut you for that) because they can't do anything until they hear from the applicant who they offered the spot to.  So, I personally wouldn't email them again.  I think the one exception may be if you've been admitted to another program since being waitlisted at your top choice, and you could update your POI with that info/reiterate that they're your 1st choice/ask for an update for decision-making purposes (maybe).  I know waiting isn't fun!  Good luck!     

Is anyone familiar with/have heard things about how much the ranking of psychology programs matter when it comes to continuing in academia/wanting to apply for faculty jobs in universities after graduation? 

Is anyone familiar with/have heard things about how much the ranking of psychology programs matter when it comes to continuing in academia/wanting to apply for faculty jobs in universities after graduation? 

I got an email from my POI at UN-Lincoln and I have been accepted into their Developmental & Learning Sciences PhD!!