http://uk.reuters.com/article/2012/09/26/uk-eu-securities-idUKBRE88P15K20120926 As well as big fines for overmessaging to fill ratios. HAHAHAHAHAHAHAHAHAHAHA
Liquidity providers will just widen the spread to compensate for being picked off. Time restrictions don't kill the business. They kill retail and investors.
If spreads are wider then so be it,they will be wider for everyone,not a select few. Time restrictions kill HFT not retail or investors,they were around long before HFT and will still be here when HFT is a shitty memory. Market confidence has never been so low as it is now and the reason for that has finally been dealt with.
throttling's fine. most exchanges exist for big brokerage to pick off client orders, so lose them. on a meaningfully united marketplace, ban sub-min-increment trading. this solves most of the problems.
sub-penny trading is the biggest problem in the market. assholes lean on guys taking risk to "price improve" and steal the trade. how does speed throttling prevent this?