i think a good balance of lotsa things, few being theory, exposure, practice, experience, improvisation...(etc etc) will make a good musician anyhow.
true, lots of "new" / "n00b" bassists dont know anything and happen to chance upon the easiest instrument to learn till a 'basic' level, so they would can call themselves a bassist. don't get offended fellow bassists, i have had friends who started out like that and later on found out how much the bass is essentially full of a world of its own that they've decided to further their knowledge in many areas to play better. everyone starts somewhere!