Contrary to what some pro-choice observers have claimed, the Tim Tebow Super Bowl ad does not "implicitly promise" that if a pregnant woman opts against abortion, her child will grow up to be a Heisman trophy-winning quarterback. After all, some babies grow up to be criminals (as abortion defenders like to point out).
The point, rather, is that Tebow's mother recognized her unborn son as the valuable person he was (and is). Every human being, at every stage of his or her development, is deserving of the same respect.
One writer puts it well: "Choosing life — the choice Pam Tebow made — is not gambling on the value of the child, it's realizing the child has value at all."