The clubs least likely to be impacted are the Old Firm. And, remember, calling the league impacted Aberdeen (who could easily argue they lost out on 3rd place money) and Rangers (who argued less convincingly, they still had a shot at the league title). But that decision stood.
More importantly, nobody has suggested teams forfeit games for Covid outbreaks. That wasn't the issue here. The core issue was that Killie and St Mirren knowingly and flagrantly ignored the protocols that the Scottish Government asked be put in place when they granted them special permission to restart the league. So not only did they intentionally put their employees at risk, and the employees of other clubs at risk, they also opened the door for the Government to shut down the game completely.