It will take time to develop Rattler, Haener or possible first round quarterback.

Rattler can make some plays but just doesn't see the field enough to really merit a serious consideration for starter. There's just nothing in his game I've seen that really wows me, whether its ball placement, pocket prescence, arm strength, etc.
Rattler reminds me of Winston. He'll give you big plays, but he'll also give away big plays to the defense. In the end, his big plays and big giveaways cancel each other out. It happened tonight on back to back plays. He makes a great play, though I don't know why he jumped, then throws a bad interception on the very next play.

There's no way to ever know the future, especially for two young QB's like Haener and Rattler. They might improve with more experience, or they might not.