I've been writing about this transition for years and I think we have now come to the new normal although there will probably be more evolution due to regulation and technology changes. Most traders are still trading as if the old normal was still in existence.
Seeing the writing on the wall I started using hybrid trading also some years ago as chronicled in this blog. I defined hybrid trading as using an algo and turning it off and on and choosing different logic for a specific context. This is, I believe, what is required to beat the algos. The speed and reactions of an algo are needed to match the speed and reactions of algos if I want to win trading short time frames. Also, my algo can read and react to the order flow much quicker than a human can.
I have hybrid algos in MultiCharts, Ninjatrader and MarketDelta. The Ninjatrader version makes more efficient use of the PC's resources and now, with Ninjatrader 8, there are microsecond time stamps on each tick so that the order flow can be correctly followed. Each platform is better at something than another platform so it is a matter of using the one that best meets your needs in both functionality and ease of programming.
My algos use a button system that allows me to combine a number of conditions and rules with specific orders that will only execute when everything is true. The pic shows the completed Ninjatrader 7 version which requires tick recording. The Ninjatrader 8 version, is still being developed but has better volume capabilities in addition to correctly tracking order flow.
The functionality needed is a series of buttons that allows me to create a triggerable set of rules that shoot an order immediately those rule conditions are true. I watch the context and when I see the right context I arm a number of the buttons so that the algo can trigger the order from my Virtual Private Server that is co located at the exchange so that I get a less than 2ms latency from the moment that the conditions ar met and the time that the order hits the exchange matching engine.
The series of buttons decribe some context as well as order flow conditions. There are also trade management buttons so that I can have the trade management orders shoot out immediately I have a fill.
This type of functionality is available in a number of platforms out there now.