The end result of ABC replacing Tapper at the WH with just an ordinary lefty drone will just be smoother sailing for Obama at his press conferences.
As for CNN, I'd be quite surprised if Tapper changes the lefty political culture there much if at all.
Tapper gets to anchor, which is the top of the career pyramid, so, of course he’d take that. He brings journalistic credibility back to CNN, something in decline since the Gulf War, and eventually missing altogether, and as Steyn said, Tapper’s not a conservative, so there’s no chance of changing the lefty culture at CNN — viewers will do that. In a couple of years, who knows, we may be still sulking here about the Arab-backed co-opting of Fox News after their 24/7 smears of Israel during the next war with the Hizzies and Hamas, while remarking how much better CNN has gotten.