This could be a cost-cutting move, or (inclusive or) it could be a move that tries to anticipate the political orientation of Skydance's owner. There has been a lot of speculation about that, centering on Colbert and on Jon Stewart. The timing of the announcement, ten months in advance, is also curious.
The Skydance deal isn't done. This removes an excuse for the administration to object or obstruct.
If I were the gang at the Daily Show, I'd be nervous. If Paramount moves on them, it won't just be Jon Stewart.