I saw that. It largely echoes Guitar Player's "Who Will Save the Guitar?" article from a couple months ago. It isn't just guitar, though. There was a time when you HAD to have a piano in the parlor and a daughter learning Chopin on it to have any claim to middle-class respectability. Those days are gone. In the 1920s there were gangs of mandolin clubs all over the place. Now it's a niche instrument for bluegrass and a couple other genres. Currently I see stores in the mall with ukuleles on a rack, and uke clubs popping up in lots of places. These things come and go and nothing lasts forever. A certain style of music becomes dominant for a generation and everyone thinks it's forever, but it isn't.
I was watching this PBS documentary series on the recording business. Different episodes talked about voice, various instruments, sampling, etc. The one on guitar basically stopped at Hendrix. I think that's a travesty, but it says a lot about current PERCEPTIONS of the instrument.