I too like NCL's alternative restaurant strategy and I eat at all of them and plan the additional charges into my cruise fare. I like the variety.
I do see the trend increasing and additional charges for different entertainment, dining, night clubs and activities. Is this bad? No, but it changes the image of cruising. It does reinforce the idea of "nickle and diming". If people do not want to pay for it then they don't have to participate but when you see a list of "fun and exciting" things to do on board and 3/4 of them come with an additional charge it can be off putting.
The cruise line will push the pay as you go and surcharges to the point they "go too far", as with the ppv movies, and will back off on the strategy. Where that point is will be determined by the consumer.