Well, I personally have not been on GFaqs much ever since...what 2007?
I rarely ever login and only come by from time to time, mostly for looking at stuff for older games.
Still, I believe GFaqs would never really die out, simply because of the FAQs/Walkthroughs that have already been made and those that will be made for future games.
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"If beauty is in the eye of the beholder, I'm convinced that these two are blind."- Phoenix Wright, AA:T&T.