The thing about your second suggestion, although quite useful for pianists, is that it "detracts" from the experience of playing other instruments. Music theory

The thing about your second suggestion, although quite useful for pianists, is that it "detracts" from the experience of playing other instruments. Music theory is not confined to a singular instrument. Guitar tabs suffer from the same problem; you're not learning how to play music, you just learn how to operate a guitar as a mechanical tool (e.g. if I play the 3rd fret of the 2nd string, I'll achieve the desired result, nevermind what that actually is). The beauty of a musical notation system independent of any instrument is that it works for all of them! Regarding your first suggestion, there is actually a relation between the two staves: the ledger line above the bass clef and below the treble clef represents the same note: a middle C. Also, keep in mind that, the "larger" the staff, the harder it is to recognize quickly the note to play. It's not a bad idea though, and worth exploring!