I think cloning is fine.
We here on MiceChat are an enthusiastic bunch of Disney park fans and because we are, many of us have been to more than one Disney resort. So when we go to other Disney resorts, we enjoy the different attractions at those resorts. However, us MiceChatters are far from the average Disney guest.
The truth is that the average Disney guest does not go to more than one resort so cloning doesn't affect them at all. Actually, it's only a plus as they will now be able to get to experience a particular attraction that another resort will has as well.
The WDW visitors on the east coast do not visit DL. Personally, I'm the only person I know who goes to -- or has ever been to -- DL. I'm not saying there ain't some folks around here who go to DL, but I've never met anyone else. However, I do know and have met many people who have been to WDW, but have never been to DL.
Ride cloning is Disney being realistic. It keeps costs lower while enabling the parks in their resorts to expand. Being that the majority of guests do not resort hop, it's a win-win for the company and guests.