Yup, this is a very non-shocking development that basically everyone predicted. They are clearly done with him and want to get what they can out of him in trade.
Which would suggest that they would be looking to draft a QB next year: journeyman Jacoby Brissett isn’t their future (and he turns 33 next week), and the only two other quarterbacks they have under contract (Kedon Slovis and Jeff Driskel) are similar backup/practice squad journeymen.
At 3-9, you would think that the Cardinals would be headed towards a high draft pick, but there are a bunch of lousy teams this year (a number of whom are also in need of a QB), and if the draft were held today, Arizona wouldn’t pick until #8.
So it’s smart to get what they can. This season is lost and if they can get some extra picks, maybe they can trade up to grab someone with promise next year.
Gannon inherited Murray, and I’m sure he’d love to have a say in a replacement.
I hear Aaron Rodgers may be available.
I doubt he will be, and hope he won’t be for all our sakes. He already said he was planning to retire at the end of this year, and the way this season has developed, I doubt he has changed his mind.
Maybe the Browns will be willing to trade Watson though? 
It’s a hedge.
Murray can still be a bridge QB next season for Arizona if nobody offers sufficient value. They’re probably looking for a 1st rounder or a couple 2nd rounders. Not unreasonable given the QB market at the moment. He’s probably near the top of the list of available QBs.
I think Rodgers might want to play. The problem is that any team desperate enough to give him a shot isn’t a team he’d want to play for
This SI article, from earlier this week, ranks who they consider to be the top 50 free agents for next year (pending guys getting re-signed by their current teams, of course). There are only two QBs on their list:
- Daniel Jones is listed at #1 (though it seems likely that the Colts will try to keep him, either through a franchise tag for one season, or a multi-year contract)
- Rodgers is at #36
Given that, there might well be a good trade market for Murray.
My comment about Aaron Rodgers being available was facetious. He’s old, no longer mobile, and lost some steam on his throws. He won’t come back (shouldn’t say that, his ego is still All-pro).
Murray out makes sense. What doesn’t make sense is Washington Commanders head coach throwing Daniels out there again. Quinn already admitted it was boneheaded keeping Daniels in during a lost game. Daniels suffered a dislocated non-throwing elbow in garbage time. Luckily, it didn’t need surgery. Quinn’s rational is, Daniels need work with his receivers??? I suppose. With the Giants, Titans, Raiders, Jets, Cards… already stealing/battling for the number one draft slot; it’s too late to tank. Edit: Forgot my Brownies in race to mediocrity.