Mike Singletary's job as head coach of the 49ers remains safe for now, according to team and league sources. The 49ers fired offensive coordinator Jimmy Raye on Monday and replaced him with quarterbacks coach Mike Johnson. The 49ers don't have a logical successor should the team decide to go in a different direction. Even if the 49ers salvage their season, there is no assurance Singletary would return next season despite having two more seasons remaining on his contract.