The San Francisco 49ers are well positioned to remain as one of the NFL's elite franchises over the next three years.The 49ers have advanced to the NFC Championship Game the past three seasons, cementing themselves as a top franchise. In the next three years, the 49ers should be in good shape because their roster is deep and young.And it all centers around quarterback Colin Kaepernick.The key for the 49ers' success in the next three seasons starts with the quarterback.