It's damn near impossible to predict, but at the same time, you better get it right because if you change it 1 or 3 years down the road... It becomes a completely different coin in one line of code.
I don't see it that harshly.. otherwise you could say that the moment someone creates an ASIC it becomes a completely different coin. Or the moment someone creates a more optimized miner. Or Evan adds a new feature.