I think you can make the argument that the Cards should go into next year assuming Kyler is never going to be their QB again.
Honestly, Williams is a taller Kyler Murray IMO, Great arm, good runner, not great pocket presence. Lots of stuff he gets away with in college he won't in the NFL. But absolutely elite arm talent and he's several inches taller so more room for error.
i think Murray will be back but I think the Cards have a tough decision. I would not be surprised at all if Colt retires, I would start McSorley the rest of the year just to protect Colt from hits, if he's ok with that. Then try to convince him to play next year with the idea he holds it down until Kyler is ready. But I kind of think he retires. So then you have to find a bridge until Kyler can play.
If that Bridge is 4 games you are ok, if it's 8-10 games you might as well tank.