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If orders are filled pro rata, is there still incentive to engage in HFT? Because pro rata nullifies the time precedence rule, my intuition is no, but I figure there could be other aspects to it I'm unaware of.

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The Eurodollar market is partially pro-rata. And there is a lot of HFT on it. Getting out of the book when conditions are not right is very much HFT.

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When you say getting out of the book, do you mean order cancelling or something else? – Joseph Garvin Mar 13 '11 at 22:06
Yes, order canceling when your algo feels that it's a bad place to be in the book (it's about to get hit) – Adal Mar 14 '11 at 11:26
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Market markers still have to consume market data. The techniques required to scale a live order book in real-time will be the same regardless of the intended use case. So while the strategies will be different from what we know as HFT (and even the participants different), the systems in use will be very similar.

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My guess is you are right in that it will be unprofitable to be a liquidity provider because of the lack of time priority.

However, liquidity taking strategy (taking out an order that is mis-priced) is still a speed game.

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By 'taking out an order' do you mean cancelling your own order or filling someone else's? – Joseph Garvin Mar 13 '11 at 22:10
Taking liquidity usually means filling someone else's. – Konsta Apr 18 '12 at 21:32

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