Sinister and Surreal showcased that half-baked Icons really don't add to the event, and in some cases can bring the event down.
Dr. Oddfellow on the other hand, easily one of the strongest Icons we've had in a long time. He had a presence throughout the entire park as all the zones revolved around him in some fashion, outside of those you'd hear his whistling in the park music loops, and he had a very good house in a year that had killer line-up. With how they handled him, he brought that Je ne sais quoi that not every year gets.
For me, Icons are not required for the event, but in the case they do bring one, I would very much prefer they take their time in creating and incorporating said Icon into the event a la' Oddfellow. And if that means skipping a year or two for an Icon, then so be it.