Five strings really are mainstream now!
Flicking through the 'latest' activity I counted eight fivers, a four string and a double bass in the first ten istruments up for sale.
I was going to mention I have two, but realused I have three.
Personally I prefer four strings, but five seems to be the magic number where you can still play with a substantially normal tecnique and benefit from the extra range, especially when combined with 24 frets. Six and seven just start to impose impossible stretches if you want to keep your thumb behind the neck.
Of course, my snapshot statistic could mean that everyone is trying to get rid of their fivers...