Question for all blu-ray supporters

[JLaSoul]

I've been told and saw that the people that handle blu-ray has not yet used it's disc to it's true potential, that's why some look better than others, and also heard they are going to put out another fifth element that is suppose to be better than the first disc in quality and everything else. Where I'm going with this question is, when they do get it finally right like dvd movies now, they us it to it's limit, are we going to have to buy these movies all over again? Because think about it, when blu-ray wins this format war, if this is all true and they will release better quality versions, it would be the same if blu-ray lost because if we really wanted true hd we would have to buy all movies all over again. I know training day is probably the only blu-ray movie that I've seen that is not to it's full ptotenial because I can say that the normal dvd almost looks better. Are any of you kinda bothered by that if this is true? Please shed some light on this subject for all who know more than me.