Not sure if you're aware, but the Hero Luke comes with 2 interchangable emitters. One with a skinny neck for display, & one fat to accept a blade. I'm pretty sure the Ezra would be the same set up.
I can't speak for him but if he is of the same mind as me, you want the hilt look a certain way with the blade installed too. I do not collect much in the way of FX hilts but I would like a decent Luke Return of the Jedi FX saber. I am willing to trade off some accuracy for price but the fat neck is a issue for me. Now, if i just wanted it for display, I would be tempted but i already have something for that.
Now, if I was interested in a Ezra hilt, and not concerned with the FX blade, I would be up for it. I think a lot of people were more interested in the staple gun version. That would have been cool.
I think the Qui Gonn hilt will be nice if made but I sort of respect that if it is, they will have to fudge the slots in the grip section in order to deal with internals. I don't know that for a fact as i am not an expert on how the inside of Disney, or really any FX lightsabers are made.
Out of the Legacy hilts, the one I really want are the upcoming Ahsoka clone wars. I doubt they will be for sale on line. I have a nice set of static hilts but the design, the pictures of the products and my love of the character makes me want them.
It's not that I don't like the others, I simply either have exiting FX versions, static display versions, or not interested in that particular hilt. I would not mind the temple guard but with all the other unique products that GE has, I simply do not have the money to spend on everything I wanted and there are several other products I would rather have than Legacy sabers.