I don't think there will be A given format that will last for long. I think DVDs have lasted long enough. Probably Blue rays will be there for another decade, now that the HDDVD format has definitely lost the battle. The Blue ray players will play the DVDs, so nothing goes waste. Unless, all the old films that you've got in DVDs are going to be re-released in Blue Ray. I am not sure if the average movie today has enough high definition content that will make a big difference in Blue Ray. Maybe the movies they make now and in future will be made with Blue Ray in mind.