Just my two cents, but if the drop tuning actually serves a purpose, then fine. But too often, what we see (and hear) are guitarists playing in Drop D or C# or whatever...because it's 'cool' to say you play in Drop D or C# or whatever.
If anyone saw the know-it-all clown on VH1 Classic Rock n Roll Fantasy Camp telling the rest of the band to play in Drop D, then sounding like a complete fool when the keyboard player asked what the actual chord he was playing. He rattled off four different chords before he figured out what was actually being played. "Uh... F...no, it's D...uh, no it's C#...wait, I mean G..."
Besides, it's all a moot point. I just looked it up in the Book Of Rules, and it clearly states Bass Guitars shall be FOUR strings, tuned EADG, and all music shall be in 4/4 time. And louder is always better.