I think it would be a very good thing. Why wouldn't it? If speakers had a flat frequency response we would achieve more accurate sound reproduction. I understand that this is impossible, particularly since speakers operate in listening rooms and respond differently to every room in which they are placed. Nevertheless, a flat response would be a very good thing to me, even if it were achieved only in an anechoic chamber. At least that would provide a more consistent starting point for speaker placement and equalization.