Pool hopping will be good for everyone (I think).

It automates the manual reviews people should be doing of pool returns anyway.
It should speed up the movement of miners alway from pool owners that don't offer the best deals to miners.

In the financial markets, it's called arbitrage. Like automation in these markets it will produce some quirky results do to short term randomness. This could be an issue if everyone does it (this should happen long term). By then, hoppers should have setting to control testing frequency. Setting that to once every few days would fix these issues, while moving people to the pools with the best policies over time.

Its a tool, how people use it is up to them.

My 0,02 BTC worth.
Spoken by someone who's still trying to configure their first rig! (So I haven't actually used a hopper yet.)