There's a shoot interview with Rey somewhere on YouTube where he talks about losing his mask to Nash in WCW and how it was the worst moment of his career. IIRC, Bischoff or someone basically called him and said "either you lose the mask or you're fired" despite him expressing how uncomfortable it made him.
I don't think Rey will lose the mask again, even though this is the second major feud he's had in the past year where they teased it. It was mentioned before, but the masks make the company too much money...if Vince is blasting people for wanting to take the risk of turning Cena heel, I don't imagine he'd be comfortable with Rey losing the mask unless it was like in a feud with Triple H or something (which, ironically, would pretty much be a repeat of the WCW fiasco).
Not to mention he'd look hideous with a mask these days, with his head all swollen from the steroids/HGH.
