Trading has been changing significantly since the 'big bang' when trading went from pits to electronic. From there on in you see the evolution of algorithm / program trading. This area has been using quants for decades at this point. There are a good few big names brands out there that are known for being 'algorithmic heavy', Man, Citadel, DE Shaw come to mind (I"m a few years out of date). That whole field has been open to introducing automation / algorithms to create a business edge and will probably continue to advance because its good for business. The profile of traders has also changed (Barrow boys versus PhDs)
Then I guess on the other side is investment banking such as m&a, equity and debt capital markets. Generally there its relationship based , juniors work on pitch books which from what I saw / heard were generally overlooked. This is potentially a lot harder to automate away. Then the bank would try to pull in some rain makers or grow them internally to land big deals. Usually these opportunities open up because their clients (Other companies) have learnt to trust the organization or at the least learn to expect a certain behavriour when enlisting their services.