Okay some thoughts on this:
#1: Idzik is in his first days at GM and just a few days ago he was a compatriot of John Schneider. It's conceivably possible that Seattle has no real interest, but is getting involved to help drive up the price as a favor to a friend. Having a friendly GM on the other side of the NFL owing you a favor is never a bad thing.
#2: It's not delusional to think Seattle would have interest. Schneider's MO is due diligence.
#3: If the NFL was without a true salary cap (like MLB), Revis would not be getting traded. But the Jets are well over the cap already and would be highly unlikely to keep Revis next season. This deal is all about saving money and squeezing value out of Revis before he walks next season. From Idzik's perspective, trading Revis makes a ton of sense.
#4: So what does Idzik want? Good yet cheap players because cheap players help cure salary cap ailments. Idzik knows our roster very well- and Seattle has no shortage of quality players on cheap contracts. Draft picks are a great way to get good, cheap players too. So I see fertile ground there.
#5: Why would Seattle do it? Because Browner is a free agent after next season and might command a large price next offseason. Remember when the Seahawks traded for Zach Miller and people asked "why? we already have John Carlson?" As it turned out, Seattle decided they'd rather pay a little more for a far better player. If Seattle did trade for Revis, it would likely spell the end of Browner here, and since Browner is on a low cost 1 year deal it's possible he could be a part of the trade.
It really depends on the deal, but if Seattle created a reasonable win-win package for Revis (maybe a 2nd rounder and a couple of good, cheap players such as Jeremy Lane and/or Doug Baldwin), I think it would be worth it. Revis on his next big contract will only cost a few million a year more than Browner would, and Browner might not even have a ton of years left playing corner before he has to move to safety. Revis only makes $6 million next season (though Seattle would probably ask for an extension before signing off on the trade) and for the right price wouldn't necessarily inhibit Seattle's ability to pursue pass rushers in free agency or the draft. I don't think it will happen, but I could see it.