I would have preferred Arizona win, but the fumble at the end was the right call, and there was no need to review. In the last two minutes a coach's challenge is not necessary to review, so the onus is on officials upstairs to look and see if it is a close enough play to review. If it is, they radio the on-field officials.
In this case, it was clear looking at a quick replay or two that it would not get overturned. Warner's arm was never moving forward with the ball in his possession (he touched the ball with his arm going forward, essentially pushing the ball, but lost possession when the defender hit the ball before his arm was ever going forward).