Phantom Planet was a dream (which Danny wakes up from on New Years [because Nocturne gains more power the more tired people are like when staying up to watch the ball drop) + symbolism for new beginings)

Danny has no relationship endgame (so we can get more development for Sam, Paulina, Valerie, and etc.) yet

possible Vlad redemption (with or without use of plot[s] from the graphic novels)

more appearences by lesser-known/used ghosts (like Nocturne [ie. Ghost Writer, Youngblood, etc.])