I had considered oil prices to be the primary threat to an accelerating recovery. I do think the fundamentals are ripe for an accelerating job creation rate. 300K+ a month is not fundamentally unrealistic at all.
I know believe, however, a panic-y federal reserve and an over-obsession with keeping inflation expectations moored is the biggest threat.
For now I think it should be the mission of every Journalist to harp on Fed Officials as to why they are willing to tolerate half a decade of unemployment above 5% and the devastation and loss of skills associated with that but they are not willing to tolerate Core-PCE rising above 2%?