SimJimons - -"Moto moto, most HFT strategies are built around market making concepts, and as such they are trading against the trend. Hence, it might be a little difficult to blend HFT and trendfollowing in the way you proposed"
As an ex options market maker, I actually was more momentum based, and not necessarily "against a trend"- I just used the extra edge off a theoretical point of view to try and build positions when they went in the way of what I determined the trend to be. Often if you can capture those trades where the trend is with you quicker than others, or skew your biases slightly that edge can be enough. (In my previous experience often enough it is those others crossing the spreads that are actually trading against the trend....but every day is different)
You can actually use momentum strategies with HFT, and their idea of a trend time frame is clearly different to many others.....so I disagree and think you can blend HFT trading and trend following.
(maybe this is just a different definition of HFT but I dont think the two HFT, and TF are mutually exclusive or worth thinking that HFT guys do it exclusively in one manner or way)
but I definitely agree they will most likely eat their own young.....when they have more IT staff than traders its a different race