Hmm, I'd tend to disagree. Celtic, Rangers dominance has been increasing since the 80s - wasn't exactly like Sky were bring the money to the Scottish game all the time.
SPL has been 2 big teams, with the rest all a much of a muchness. It's generally been a case Celtic, Rangers looked after themselves and sod the rest which is why the standard is poor. Compare to the EPL, there's 6-7 teams in contention. SPL, well 1 at the moment.