Cards need to draft their QB and go get a vet journeyman QB for next year, like a Tyrod Taylor. Someone they can have for a year to start and give the rookie QB a chance to grow and for the team to develop good players around him.
This is an older team. They have one good WR and he is a gray beard.
The D is old. The Oline is poor. They have a RB coming back after serious injury.
And they'll have all new systems.
If they were a QB and a couple of pieces away from a Superbowl run, then fine.....go get that upper tier vet QB to start.
But where they are now, they need to do what the Rams did. Draft a young QB and develop him, and then starting stockpiling young good players.
I think that's what they'll do with Arians gone.