When they are as important to the sound as Moon and Entwhistle were. 3 dead members of New York Dolls--but it's the loss of Johnny Thunders that keeps them from actually the New York Dolls. Last night there were more non Who members on stage than actual Whoateers.
At some point the name, and what it stands for, has to stand for something. Otherwise you end up with KISS putting random dudes in Ace Frehley makeup. Right now the Who is a nostalgia based moneymaking scheme. Call me a purist or naive or whatever, but I find Who, inc depressing.