Concur with most here. If we are in it, even if we think the likelihood of winning a WS is less than other teams, if we are in it, we keep Correa. It makes NO SENSE to trade him at that point, none. Lewis will not fill his shoes at ss no matter how good he's doing, he will not, not even close. And trading Correa while we are contending, we may as well just hang it up and not contend.
As for what we could get for him, we will never get a return for what he's worth, never. No contending team will give us enough because they want to keep their pieces, too. And no building team is going to give us that many prospects for someone who is gone at the end of the season, because he will not stay on a building team and will opt out.
And if we are completely out of it, and I mean zero chance to make the playoffs then maybe we can have a discussion, but that is looking less and less likely the case. We will have to see what the next month brings.
Remember Santana and what we got for him? I consider these two comparable talents. Yeah ... no team will be able to afford the prospects or players in a return and we will be the worse for it. The lesson from the Santana trade is to keep your best talent and try to win, and if he walks at the end, so be it.