I disagree with making different clefs the same. Clefs are different for a reason-- they attempt to keep most notes on the staff. Bass and Treble have won out over competing clefs (if you ever want a challenge, trying reading the various versions of C Clefs like alto/tenor) because they keep most notes on the staff most of the time for most instruments. (Violas, Celli, Trombones, and a few others excepted).

There's also the fact that Treble (G) Clef and Bass (F) Clef are a perfect fifth away from Middle C, which reinforces the importance of perfect fifths in the system of major keys, but I suppose that's a small consideration overall.