Prospective Trader in need of help.

Theres two side to the "technology will replace traders" argument

Execution Based: Stuff like execution algo's etc etc are only really going to replace execution trading in very liquid and homogenous products. For others its actually very helpful. I traded options, and having algo's at my disposal to execute my own cash equity orders instead of dealing with a trader. And in terms of this replacing traders in non cash equity style products (or i guess more accurately non delta 1 products), I dont see that happening because of the non linearity they usually feature. And either way this is still only confined to the sell side, for any buy side trader any improvements in technology on this side actually lower your costs and workload (I dont just mean HF's but even if you run a book on the sell side that holds a lot of inventory because of illiquidity).

Strategy based: stuff like HFT and quant strats etc. Again these generally require liquid and transparent markets, which you can argue some products will never be. And even in the markets they affect, its just another strategy, and just like any strategy it can become overpopulated. If you have 100 market participants, value often isnt in what strategy you are using, but that you are using a different strategy to play the game than other people. If 99 people are discretionary gut traders, then being the 1 quant guy you can extract all the "quant alpha" in that market. But if 99 people are doing quant based strategies then the fixed amount of "quant alpha" is shared essentially, and at that point maybe there is more edge in being a discretionary qualitative trader.