I'm pretty confident that Correa was essentially signed as a stopgap for Lewis. If he decided to stick around, that's a problem I'd definitely endure and try to figure out. Lewis' injury definitely complicated this offseason. While I think he'll return and be just fine, there's no guarantee that Lewis is ever the same. He looked the part in the field and with the bat, but I don't think we've got a large enough sample to say that he's arrived. I'm not really worried about that though, he certainly looked the part.
All that said, this team still needs a SS until Lewis comes back. I think it makes sense to go after any of the top 4 SS's and deal with Lewis's return when it happens. Sometimes issues work themselves out.