I agree that bigger is not better. BMW should not try to do a "people mover" a la MB GLs which are really Chrysler mini vans. For us, the E70 is perfect size. I don't think an X3 has the same qualities as the X5, just as a 328 is not a substitute for a 528. Like the idea of lighter and possibly hybrid, if it has the performance. Don't try to be all things to all people. Do what you do well. For BMW, that means superb performance and high quality.