Well the points I hear here, soem are utter rubbish.
One the difference of what VHS displayed (the data not how you tv handles it) and DVD while dramatic is not as significant as the difference between DVD and 1080i.
To be clear, because I made a point along these lines, one of the reasons the the DVD to Blu-ray changeover is not as dramatic as the VHS to DVD changeover is because the over-all format change is not as dramatic. Everything about a DVD from size, to features, to picture quality, to ease of use was an improvement over tape. Blu-ray offers, so far, only significant upgrade in picture quality. Which is not enough for some. There may be more features to follow, but the few discs I have don't offer them.