multipool that pays by GHC (via trade) after PoW period is over sounds great idea. I hope something like this to be available for GHC when that time comes.
Multipool would drive down price?
No because the multipool would pay out in GHC .... It would mine the most profitable coins turn them into BTC which in turn would buy GHC to pay the miners. Which would increase the price driving up the buying pressure.