I think he is largely correct on the points that Mitt was always going to win this thing and on the media dynamic.
Now I had not noticed the eeyore stuff from allahpundit, but Erickson is definitely a bit of a CNN “go to” pimp the way Scarborough is for MSBNC. As for Will, I think he’s just truly blinded sometimes by too much time inside the beltway, and is not an intentional liberal pimp - and Noonan is just an enigma but probably rotted by time in NY.
As for them losing cred within the conservative community? I think they already have to a degree - but never will to the full extent they should.
Peggy Noonan, Kathleen Parker, Christopher Buckley, Colin Powell and David Frum all supported Barack Obama and voted for him in 2008, IIRC.