I've been wondering what Yoshiaki Koizumi thinks of Rosalina appearing in most Mario games now? Probably annoyed because everything he wanted to have for her isn't there? And that brings me to the Lumas. I haven't noticed until now that lately, they aren't really doing anything besides accompanying Rosalina. And even then, nothing more than that.
However, this kinda begs the question: Do all those one-timers and everyone else really need to come back? No, this isn't a Miyamoto impression or anything, I genuinely meant that. It feels to me like most people only want all those forgotten characters to return just for the sake of returning, with no rhyme or reason as to why they'd come back.