It's a fair question. Everyone is aware the traders, which are normally a big deal, are slaves to the research gents and their algorithms.
My guess is largely, they can be. The actual trades could be automated (this would become increasingly necessary with rapid-fire [millisecond] trading, which we don't do now but could in future). The meatware oversight could be consolidated to a smaller group of individuals.
Can the traders be eliminated? Why pay them if all they do is carry out orders? (I am asking sincerely)