How realistic is a non-Old Firm title challenge?

With champions Celtic arguably weaker and Rangers enduring their worst league start since 1983 - is this the season a non-Old Firm club finally delivers a title challenge?

How realistic is a non-Old Firm title challenge?
With champions Celtic arguably weaker and Rangers enduring their worst league start since 1983 - is this the season a non-Old Firm club finally delivers a title challenge?