Should Who Be Singular & Plural

I understand the point that the author was making about how Webster referred to "who" as a singular pronoun as well as a plural one, but I think that who should stay singular. I wouldn't have a problem with it being used plurally (although maybe only because I'm used to hearing it this way), but I think that "who" being used singularly sounds better than it being used plurally. A sentence like "who are coming" does not sound like it is proper grammar even if grammar rules ever were changed to make it a correctly used sentence.