I'd be curious to know why AMM is hard to implement.
The math is absurdly easy (x * y = k) and we already have time-locks and contracts of that nature.

I've actually already programmed this functionality myself and it seemed trivially easy.
I must be missing something big.
Unless the problem is that no one wants to print more Hive to support it.
I could see how the politics would fail but not the technicalities.

Also Blocktrades is a liquidity provider so he has a direct financial incentive not to do it.