As crazy as is sounds, I actually want the flyers to draft him more than McDavid or Eichel. There is a bigger bust rate for defensemen, but if you get a Norris caliber defenseman you are a cup for contender for 10 to 15 years. Also think of this: Neidermayer has 4 Stanley Cups versus Lindros's 0 while Doughty has 2 versus Crosby's 1. Since Devils in the mid90's the league has gotten more structured and defensive making defensemen the more important position in regards to winning cups.
Maybe if we didn't have Gostisbehere, Morin, Sanheim, and Hagg in the pipeline..but we do. Most defensemen drafted that high don't have nearly as big an impact as forwards drafted that high.
In the last 10 years we have seen the following defensemen go top 3..
2004-Cam Barker (3rd behind Ovechkin, Malkin)
2005-Jack Johnson (3rd behind Crosby, Ryan)
2006-Erik Johnson (1st ahead of Staal, Toews)
2008-Drew Doughty (2nd behind Stamkos)
2009-Victor Hedman (2nd behind Tavares)
2010-Erik Gudbranson (3rd behind Hall, Seguin)
Too early to tell on 2011-2014 but as you can see, in none of those situations, would the teams that drafted ahead of these defensemen have made out better by passing on the forwards they drafted and going with the top defensemen in the draft.
As clutch as Doughty is, Tampa Bay would not be anywhere near as good with Doughty in their lineup over their captain and most dynamic goal scorer in the NHL, Steven Stamkos.
Going back to 2006, don't you think St. Louis wishes they drafted Jonathan Toews over Erik Johnson? I know I do, the Flyers would likely have wont the cup in 2010!
There is absolutely no logic to justify drafting Hanifin over generational elite forwards like McDavid and Eichel.