One thing is for certain, Y&R's eventual dominance wasn't a fluke occurrence. Throughout the 80's, they were consistent and broke through the ABC dominance for most of the early part of the decade.
They maintained their audience (for the most part) by the end of the 80's when other soaps started to lose it. Oddly, Y&R was the soap in its own bubble that didn't follow all the trends most soaps would - other than some great timeslots, I have to wonder if that's what the average viewer ultimately appreciated. God knows they're coasting off that past reputation to this day.