I certainly can't tell anyone else where they should spend their money. I confess, though, that I am not an old-timer. I have acquired a few of the modules, but I have never had a physical, paper copy of the rulebooks.
So I'm pretty stoked about the KS. I'd certainly suggest any fans of the game, even if they aren't sold on the idea of having a "spare" or shinier copy, with new and possibly fancier components, should consider trying to sell any younger gamers of their acquaintance on the KS. It's likely to lead to the publication of new modules and such, which may benefit you even if you already own everything from the old days, and in triplicate.