From Sessions' point of view, it's a GREAT move. He undoes an Obama recommendation. If Trump has any ideology, it is undo everything "the black guy" did and Sessions, remember, was the first Senator to support him. It will fill prisons. Another Obama rule that was overturned phased out private for profit prisons for federal convictions; now, they can fill the private prisons. Sessions owns stock in private prisons so he will get richer. Because it is absolutely impossible to jail every American who uses pot, tens of millions, the law will be applied selectively and we can guess what color the people selected are likely to be when the Attorney General had his nomination for a judgeship turned down by the Senate because they found him too racist to be a judge. And with felony convictions, these black and brown people will lose their right to vote in many states, so fewer "wrong" people voting. Under War on Drugs laws, people with drug convictions, even for simple possession, cannot get federal student aid so fewer college students. Educated people are less likely to vote Republican. And they will be barred from numerous benefits like federally subsidized housing, which Sessions opposes. So hell, it's all good for Jefferson Beauregard Session III, white supremacist.