It's such a sad line, it should be a country music title: If they only knew then, what everybody knows now. To put it in geek terms: Where's the Undo Button?
Probably, if they knew then what people know now, they would never have let Young Luke sit in the Council President's Chair; none of the grownups could agree so they put the rookie in the big chair and planned on having a fun year. In retrospect, maybe that wasn't brilliant.
If they knew then what they know now, the wags would not have complained that a three-way race for Mayor was a very bad idea because Bill and Mike would split the ABL (anybody but Luke) vote. When Luke implodes (or, more to the point, when his handlers get tired of all the attention in about three weeks) then it'll be a Bill vs Mike election. Good thing we started with three.
Finally, if they knew then what they know now: Peduto probably would not have decided to skip the March Dem party committee vote. (edit)
May primary. With his earlier organization he might have taken the primary and had easy sailing to the coronation.
Unwarranted Prediction: Luke's campaign folds/crashes before May, and it's a Bill vs. Mike election.
EBay Speculation: get all the Ravenstahl 2013 buttons and yard signs you can get your hands on, since they'll be valuable collector's items in a few years.