"The worst thing about this waffly kind of advice, I think, is that it lets usage commentators duck responsibility for influencing usage. They tell you all the reasons why it should be alright to use hopefully or split infinitives or singular they, but then they sigh and put them away in the linguistic hope chest, telling you that you can't use them yet, but maybe someday. Well, when? If all the usage commentators are saying, "It's not acceptable yet," at what point are they going to decide that it suddenly is acceptable? If you always defer to the peevers and crazies, it will never be acceptable (unless they all happen to die off without transmitting their ideas to the next generation)."