Ebook versus Pbook will eventually balance out as a dual format system, but with the digital format slowly taking a majority of sales. This is just like what was mentioned above relating to music and video media.
Music is still primarily a 3 format system:
1) Vinyl records still sell in small numbers which is actually starting to increase in sales now,
2) 8-track (and Beta tapes) was replaced by cassette tapes (and VCR tapes) which in turn was replaced by CDs (and DVDs), which still sells quite a bit,
3) mp3s are slowly taking the largest chunk of music sales.
Video is also a 3 format (or 2 depending on how you look at it):
VCR tapes are almost dead so we can ignore this one.
1) Streaming/online video is expanding fairly quickly
2) DVDs have the majority of video sales, and
3) the third is Bluray which is still a disc/digital media but is still its own format is many ways.
There is room for a system to include both digital and physical media. We are only now starting to see the digital book side of things expand but at some point it will balance out as the older generation ages and passes away, and the younger digital generation sticks primarily to digital media with paper being used for special uses.
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