I seem to be the only person who isn't feeling Jessica Williams.
I think she has great potential, certainly; she's clearly witty and charismatic. But something about her timing and delivery has always seemed just a little off to me, just a little flat. I think a few more years of honing her abilities on The Daily Show could make her the equal of a Samantha Bee or a John Oliver, but I don't think she's there yet. Spinning her off now would be a bad idea.
(Remember that Bee has been with the Daily show for eleven years, Oliver was with it for eight, and Carell for fourteen. Williams hasn't yet finished two.)