It could be cool to have a raw or unedited version for studying purposes, the details in the brush strokes are really cool to see .
Paintings even on paper don't deteriorate too much if they are handled mildly responsibly, that means not trowing them to gather dust and humidity in an open space.
The more delicate pieces are the ones made with markers though, if they are not covered from light sources (specially the sun) the colors fade away really fast. Watercolors and acrylic paints can be displayed without problems other than having the paper yellowing (direct sun light without UV filters can yellow the paper, also depends on the paper quality too), gouaches can be displayed too but a drop of water can do a bit of damage if it's not sealed or covered.
Oils don't have much of a problem, usually the varnish is the one that gets really yellow and dark and it can be removed and replaced, but I think modern varnishes have less yellowing problems.
*On a side note, I was looking for a better version of the Edison's portrait but couldn't find one, I only found a photo posted by Purcell a few years ago, I'm guessing this one was never made public, right?
So I took the photo and cleaned it up the best I could and turned out to have really nice colors and details I didn't know it had, it's a shame it looks a bit blurry though, we might need to send a ninja to take photos wherever the original painting is haha!.