A lot of people (myself included) already have automated setups that compare profitability between NiceHash and multipools and switch between them depending on where the money is. There have always been and will always be discrepancies between what people are willing to pay for mining and what mining actually gets you at any given time; this is nothing new.

As a side note, I personally also liked WestHash operating as an entirely separate market from NiceHash for the same reason: there would often be discrepancies between the two sites which created opportunity for profit.