Eventually the price of MemoryCoin should be the same as the electricity required to mine it. There's a window at the moment for profit, (because the knowledge is not widespread yet, and there is significant appreciation potential), but long term, things are working out exactly as intended.
Do you mean that the price will only drop over time? Because even the current price (which is quite low) is higher than the cost of electricity needed to mine the respective amount of MMC.
The supply drops over time. The price will find a way to go up. I believe the MMC market has already priced in GPU mining.