Does fox think that they have to put all their animated comedies on all in one night anyways? Why couldn't they change its regular time, or that of another show? They currently have 4 animated series, 3 of which are regularly on Sunday night (only 2 consistently, The Simpsons, which is declining but still funny and their #1 show, and King of the Hill which is also hysterical "All there is in Dallas are debutantes and crackheads, and half of them play for the Cowboys."
). It's not like the other nights haven't been successful, maybe not so as much as Sunday night, but still.