A delay won't be the end of the world, I'd rather they have the ride up and running good instead of constantly breaking down the first few weeks.
Also a "Soft Opening" of Diagon Alley, and no GB or HE, seems perfectly fair to me. I guarantee most of the locals on this board would be pretty excited regardless. It memory serves did'nt Hogsmede soft open before FJ due to techincal issues? Am I correct?