By Tzvi Machlin In 17 years as a head coach Mike Tomlin has led the Steelers to 10 playoff appearances, two Super Bowls, a Super Bowl win and has never had a losing season. But that may not save him after today’s performance. With today’s 30-13 loss to the Indianapolis Colts, the Steelers fell to 7-7 on the season. And now more than ever, Steelers fans are calling for their longtime head coach to get the axe. The Steelers have been able to stay in the playoff hunt despite having one of the NFL’s worst offenses for the majority of the season. They’ve outgained an opponent only twice in 14 games…