I have heard that it is the bass that holds orchestras together.
I suppose that both violin and bass take a different role however, there are many orchestras who do wonderfully without a bass at all.
I guess a great deal of it comes down to the completion of a song through the bass/bass guitar! Fortunately most of the
arising young musicians realize this however, I just heard an interesting new style on a play list of new songs bass lining with a violin ... pretty cool.