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From all those points you have said I have agreed
1. Wishful thinking. They deserve a break. But then, who in Ninjago doesn't, really? The nindroids haven't been corrupted, deactivated, manipulated, or thought dead since Prime Empire (and even then, that zangsty moment with Zane tethered to Unagami's portal only lasted for half an episode). So, it will surely be their turn again sooner or later, but based on what we've seen so far, I don't think it will be in Crystalized. Because ...
2. Nya. Skylor. The pink-haired girl in the van. Maybe Harumi (if the sets are anything to go by). With Jay grieving about Nya and Kai likely rekindling his relationship with Skylor, that's already a lot of romantic potential (which has never been a focus of Ninjago anyway). And there's little wiggle room to put yet another female side character in the spotlight (sorry, that's what Pixal is to the writers). I personally think she will be absent for most of the season.
3. I always felt Tommy's statement "don't wish for a Pixane kiss, because not all kisses are happy ones" (I'm paraphrasing) was referring to that Jaya scene in Seabound, not something that is going to happen to the nindroids in the near future.
4. Zane has died in an encounter with the Overlord before. We've been there, don't need that again. At least I hope so (looking at you, Mr. E!). Because it all comes down to
5. Wishful thinking.