I agree with the desire to see less romance. I'd be delighted to read more on other types of relationships. Friendships can be complex, emotional and intense at any age and I would be intrigued to see good writers really get to grips with them, from the 'known since kindergarten' type through the making new and strong friendships in your teens.
I'd also add that a number of YA books get rid of the parents too often, for example Harry Potter's are dead, Katniss' (Hunger Games) Mum is absent in spirit for the most part, Clary' s (Mortal Instruments) Mum is absent in the beginning, and Jace's parents also gone, as are the parents of the female characters in Joss Stirling's Savant series. I understand that the absence enables a certain textual tension for the character that would otherwise not exist, but it feels too convenient to dismiss the families rather than actually deal with them in any meaningful way. It also implies that one is only brave / adventurous / creative etc. if one has suffered the loss of a family or parental figure, whereas surely it would be inspiring to read that those aspects of character can be found in anyone.