The NU meta doesn't have the resources necessary to handle it. The only semi-reliable defensive answers to it would be Slowking, Musharna and Golbat. But, with dark types and pursuiters so prevalent in the tier, a well-built team can easily remove or cripple the psychic types before Machamp even enters the field. Golbat is susceptible to knock off and risks stone edge crits as well as pressure from hazards so it's not perfect either.
Options for revenge-killing Machamp are again limited, as it's incredibly bulky and now has access to stab priority boosted by either guts or bulk up. Fast psychics and ghosts would be the method of choice however they're of questionable viability at the moment for the same reasons.
Out of all the sets, I think bulk up would be the most problematic now that it has access to mach punch. I just don't see how the meta could adapt to handle it since most of its more reliable answers are already low viability or have moved up to UU.