You could easily solve all of this without HFTs - you might introduce a few seconds of latency but virtually no real investors care about that level of latency and it would save them billions per year.
> and it would save them billions per year.
This is not true.
HFTs do not take a cut out of the market, their cut comes 100% from other market makers. Those are the only folks who would benefit from eliminating HFTs, and unless you’re one of them, who cares?
I don’t care who buys when I am liquidating a position. That’s the whole point of a market. Therefore I don’t care about HFTs.