Second, "Retina" is a made up term by by Apple. It means Jack.
It has a precedent, so it doesn't exactly mean jack. Everyone knows what you mean when you say retina. It's not like we've never seen an example of a retina display before. So while in the world of display standards it may carry no definition, in the world of Apple products it means a lot more than "jack".
But yeah, the last 2 have been retina....there's no reason to assume the next wouldn't be. That's just worrying for nothing.
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Last year it was funny finding people discussing their new iPhones, then going back and looking through their old posts where they said they were never buying the 4S, it wasn't even a decent upgrade, they were switching to Android, yada, yada, yada....