Inevitable and probably the right decision, but still a little disappointing that he never truly delivered what he's capable of. I had no idea who Sin Cara (Mistico elsewhere I think) was when he first signed. I looked up a couple of tribute videos and was amazed at the things he could do, I couldn't wait to see him Spider Man around the ring and bring that stuff to mainstream TV. WWE of course made a big deal about signing and seemed to be putting eggs in his basket from day one so it was guaranteed Sin Cara would get plenty of exposure.
Then the rest of the story happened before our eyes. I remember really wanting to give Sin Cara a chance, even after his first few obvious botches I was still somewhere between impressed by what he did pull off and hopeful he would adjust and adapt in future. But after a few years of seeing the same thing - especially looking at how Hunico handles the same role with ease - WWE fans and management alike have had enough.
WWE still sees the Sin Cara character as viable for whatever reason and they've got the right person for the job. So maybe we'll see what the company wanted to do with Sin Cara all along now that all the gears are finally working. The original performer will hardly be missed.