2 part post here:
1) I am not going to say this is impossible, but it is very, very unrealistic. Salary and compensation (ie the 2 greatest factors) do not play in our favor. Yes, we have nice cap room, but we are also looking at some huge deals in the near future for our young corps (ET, RW, Sherm, etc). Likewise, you know that one (1) team will offer up something ridiculous, and that team most definitely will not be the Seahawks (see: history of PC/JS). We value our picks and losing a bunch of them is not the MO of this staff, and certainly not for a position of strength on this team (whether that is sheer talent or scheme manipulation).
2) Even if Revis is a luxury (to an extent) you never, ever turn your back on making your team better. Think of it this way...would you trade James Carpenter (and I really like Carpenter) for Darrelle Revis right now? The resounding answer should be "well no sh!t Sherlock." In essence (granted hindsight), this is a possible scenario trading Revis for a 1st rounder. Now, you could obviously "miss" the chance of drafting a great player, at the same time. The point is, you know what you are getting with Revis, even if he is coming off of an injury. ACL, like Tommy John (which I've had) is so advanced nowadays, that it takes an (anti) miracle to not come back from it. Is it a luxury? Sure it is. But, you are also talking about a player who drastically changes what you can do on defense.
All I am trying to illustrate, is that even though this is a highly improbable scenario, it does in fact make sense from a strictly "make your team better" point of view. I think Browner is a terrific CB, but he's not Revis. And like I said, further enhancing a strength, is never a bad thing, as long as it doesn't completely jeopardize and weaken a weakness.