First of all, the GP take IS .60, that is on an annualized basis, which is indeed .15 on a quarterly basis.
Note: GP tax is NOT 31%, tell me again what your spreadsheet spits out when the GP gets .152 out of .64 total paid out. My trusty HP32SII tells me 23.7%, and what a surprise, but excel does the same. Must be a problem with your spreadsheet.
Also, you seem to worry about growth 2 or 3 years from now, why? Don't you think every MLP is going to be in the same boat? I suspect that we will see a wave of MLP mergers. The sector is becoming quite competitive. I suspect that we will see a lot more organic projects and perhaps cooperation between numerous MLP's to finance big projects (maybe the Alaskan Natural Gas pipeline with its 10+ billion dollar price tag ??). There are still many pipes owned by c-corps, private parties, E&P firms etc that can be put down into MLP's.