Yes
Why I think its going to happen (note: not a "why its a good thing" list)
1. As far out and unprecedented as it sounds -- the Cards just hired as HC the below .500 record fired coach of Texas Tech. Clearly Keim and Mike B have demonstrated they are ready to embrace and act on out of the box ideas.
2. I think that Mike B / Keim concluded that to win the NFC west with McVay's Rams, Wilson's Seahawks and Shanahan's 49ers -- they will need a dynamic offense more attuned to where the NFL is headed-- rather than a more purely from the pocket traditional offense with Rosen. It would explain KK, and by extension, Murray.
3. I think watching Russel Wilson for the last 5/6 years is influencing Keims and Mike Bs thinking.
4. Daniel Jeremiah made an excellent point: you can get 99% of the draft smokescreen benefit, but also not have Rosen twist in the wind, by affirming he is the QB, but you are open to dealing the pick and have had discussions with teams on that ---- but the team didnt. Rosen was the QB "right now".
5. its possible that the Cards have graded Murray off the charts -- and Keim is simply following best player. Its not like Murray isnt highly rated -- PFF has him #1. Most others have him the #1 or #2 QB. He did put up crazy numbers and win the Heisman.
Years ago -- the Cards had Jake Plummer as a rookie, who did some nice things. They won their last game of the season on a last sec FG that year, and as a result, fell to drafting #2. That was the Peyton Manning draft. Imagine that FG was missed and they were at #1. Do you pass on Manning because you already had Plummer? (I get, not totally comparable, and hindsight makes the answer easy).