If you can figure out a way to land Andrew Luck by giving up Brandon Marshall, you ABSOLUTELY pull the trigger on that deal. No doubt about it.
Look around the league at the teams in the playoffs.
Tom Brady
Ben Roethlisberger
Mark Sanchez
Joe Flacco
Matt Cassel
Peyton Manning
Matt Ryan
Jay Cutler
Drew Brees
Aaron Rodgers
Mike Vick
Matt Hasselbeck
Only team with a real QB issue right now is Seattle and Hasselbeck has been pretty good his entire career. You NEED a QB to get anywhere in this league. That cannot be argued. QB is far too valuable these days. That's why the NFL is enforcing all of these rules when it comes to hitting the QB.
Go look at the teams who didn't make the playoffs.
Chad Henne
Ryan Fitzpatrick
Jimmy Clausen
Alex Smith
Just to name a few.
Go get Andrew Luck. Somehow. Make it happen.