Seriously? Ramsey actually had a great year this year, and I didn't see much of - if at all - a dropoff. Now, do we need a clear upgrade on the other side? Sure, but with Ramsey and Durant, you have a couple of solid corners, and even if Ramsey wouldn't hack it at cornerback, he still has more than enough athleticism for safety.
Trade him? Hell no. Like AD and Kupp, it would have to absolutely blow me away, like a stupid offer.
To play Devil's Advocate here. His great yr, which I am not disputing, didn't help much and its not just because of injuries elsewhere. One way you could look at it is that the rules favor the offense so much, is it a waste of money to pay a great vet CB when his effectiveness is limited by those rules?
Maybe we are better off investing those cap dollars where its maximized. The OL, WR's, & TE's. And defensively, the DL where you can short circuit the advantage the offense has with a physical DL. And also for the future, if you can, swing those picks you get in return for him to obtain a QB then that fits as well with what you need to win.
Your DBs can't touch a WR and certainly can't cover more than 3 secs or so. So invest in the offense and DL. Add young fast CBs that compete, but don't spend big money there.
So if it happens it will be because of some of those points I made above.
You keep Ramsey or....
Invest future cap dollars where it's maximized at multiple offensive positions or a long the lines.
Use picks to find the next QB and or to strengthen OL, skill positions, or DL.