I believe Wallace advocates a social contract when saying "We are all at a table together, deciding which rules to adopt, free from any vague constraints, half-remembered myths, anonymous patriarchal texts and murky concepts of nature. If I propose something you do not like, tell me why it is not practical, or harms somebody, or is counter to some other useful rule; but don't tell me it offends the universe."
Daniel Dennett gives perspective on the is-ought problem, arguing that although one cannot "rush from facts to values", nevertheless it is necessary to consider is-statements when attempting to derive an ought:
Ethics must somehow be based on an appreciation of human nature—on a sense of what a human being is or might be, and on what a human being might want to have or want to be. If that is naturalism, then naturalism is no fallacy. No one could seriously deny that ethics is responsive to such facts about human nature. We may just disagree about where to look for the most telling facts about human nature—in novels, in religious texts, in psychological experiments, in biological or anthropological innovations. The fallacy is not naturalism, but rather, any simple-minded attempt to rush from facts to values.
—Daniel Dennett Darwin's Dangerous Idea