The trend certainly is towards having one device. Stand alone PDAs are rare now (are any even sold) because smart phones have taken over their functions. I used to use a separate MP3 player, but when I bought my iPhone, it took over for my MP3 player.
I had a 7" Android tablet (one of the early cheap ones) that I used as an ebook reader.
But I recently switched to "one device to rule them all" my Galaxy Note. It replaced my iPhone and my 7" tablet. With its 5.3" screen, it is very comfortable as an ereader.
Smart phones are like swiss army knives. They aren't the best at much of anything, but very handy because you have so many tools in one device you can put into your pocket.
I am sure our first pictures of Sasquatch or aliens will be taken on a smart phone instead of a DSLR because everyone has a camera phone with them.
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