It's been established time and time again that not only is the "relationship" between Finn and PB completely one-sided, but PB is at least five years Finn's senior. If they intended on fleshing their relationship out more, they would have kept her young after her run-in with the Lich.
I like Flame Princess. She's fun, interesting, and the "we love each other but can't touch" aesthetic is a goldmine for future plot devices. I'm glad the show keeps things fresh.
I also like how all of Finn's potential love interests so far have been portrayed as being completely insane one way or another.
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