I do need to ask, do you still break dance?

At least for photographs, since it is unlikely you will have a scanner that will scan at a resolution higher than the photograph it self (thousands of pixels per inch – to the point where you see the actual dye clusters in the photo). If you toss the photos and then get a cheap scanner that has much higher resolution than what you used on the previously scanned photos, you will regret your decision of tossing the pics.

For video and audio I would give a qualified yes. If the video and audio you scanned were commercial items (movies, albums etc.) then, sure, toss them. Keep the albums if you want the artwork (of course, you can scan that). For personal, original stuff, keep it. Same resolution argument applies but they could also be used as a backup in case your hard drive fails or the data is corrupted somehow.