A bit early to tell, but I think my first order of wafers is going to be 30 PetaHash = 30,000,000 GH, by the end of next year it certainly be in 1,000 PH range, god only know what Knc/Kcn will come up with
How much total power do You need for the 30 / 1000 PH ? Where do You think You can get this power ?
Most data centers I know are limited by power.
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Currently ~100 MWatt is used for BTC mining [assuming only GPU exists and there are no FPGA and ASIC miners]. Powering 1000 PH with this would be difficult (impossible now, but possible with low voltage 28nm ASIC).