In a way, yes considering the WWE waited until very recently to really try to find a real replacement even though it hasn't worked out well with Sin Cara so far. If anything Rey Mysterio's masks are a huge reason considering how great those sell which is something the WWE tried to replicate with Sin Cara.
The only other person who has come close to Rey's Latino popularity was Eddie Guerrero until his untimely death. He was gradually growing in popularity as a face and could have easily passed Rey if he had more time.
They do have Del Rio who was a huge star in Mexico but right now Del Rio likes being a heel after getting tired of being a face for years in Mexico.
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