When a team loses in the postseason for multiple seasons, the natural question is to ask if their Super Bowl window is closing?It may be natural to some to ask that about the San Francisco 49ers. This team has lost twice in the NFC championship game and once in the Super Bowl in the past three seasons. The rumblings are being heard: "The 49ers have peaked." "They can't win the big one." And, yes "their window is closing."Here's my advice to those who are pondering if the 49ers have missed their opportunity: Throw that notion out any window you wish.