I don't know. I can only answer this after I've seen New Moon. Than I can compare the two film and make my own conclusion. But I think it's too soon to make judgements. Let see first how the detik movie works out, they could always ask one of the directors of the first two film to make Breaking Dawn...
In some ways I think yes, because it's a whole new experience each time. But I guess we'll never know if it was for the best atau not, because it's not like we can go back in time and change anything.