I think the most crucial aspect of his appointment is that he knows what it takes to be a United player at the level we aspire to be at.
This is a man who played for Alex Ferguson for eleven years and shared a dressing room with Roy Keane, Paul Scholes, Ryan Giggs, David Beckham, Peter Schmeichel, Jaap Stam, Rio Ferdinand et al.
Our previous managers wanted to put together a United team in their image. They were outsiders with their own views and blueprints. Solskjaer's blueprint is based on Ferguson's United. His number two was Ferguson's number 2. There is a link to the past and while in some respects "the United way" is an overblown line trotted out, the "Ferguson way" is a reality. The former is a romantacised vague expression, the latter refers to how one man stayed at the top for two decades.
What were Ferguson's biggest qualities? He was ruthless, he was self-driven, he was adaptable and he relished new challenges.
Solskjaer's got a the ultimate challenge of getting us our first-SAF title. Having been a member of United sides that dominated for years he will have a clear idea what technically and mentally this squad needs (and what it doesn't need), hence "survival of the fittest".
Furthermore he knows what the fans demand having played here whereas Moyes, Van Gaal and Mourinho stuck their head in the sands.
He is not a given to succeed but I believe a direct lineage to the past is what will propel United back to success in the future because in many ways we stepped away from what actually made us dominant in the pursuit of instant glory after a tough couple of years. If Solskjaer fails I do not know where we go from there.