I wonder if Kindle adoption would increase if Amazon offered people the option of exchanging physical books and electronic ones? I don't own a Kindle but I hav

I wonder if Kindle adoption would increase if Amazon offered people the option of exchanging physical books and electronic ones? I don't own a Kindle but I have some books which I would rather have in electronic form (particularly ones given as gifts which mainly take up room on my shelf). I'd also be much more inclined to buy electronic books if I knew it wouldn't cost me much if I changed my mind and wanted a physical copy.