For any RPGamers, he was like a living legend.
Like they said in the article, without him trying to adapt fantasy battle-simulations to cardboard games, maybe we wouldn't have had all those fantastic games over the years. Whether it to be on cardboard, computer/consoles, trading cards or MMORPG.
I mean, why do you think obscure writers like say Tolkien (Middle-Earth), Lovecraft (Call of Cthulu), Moorcock (Eric of Menilbonee), Zelazny (Chronicles of Amber), and many others, would be the original creators of universes in which thousands of players enjoyed countless hours/days/years of fun, if it wasn't for the new approach to simulation that Gigax and his pals helped to invent while at university ...
I mean, how could a movie trilogy like the "Lords of the Rings" be waited with such expectations, and been such a phenomenal success, if it wasn't for the hundreds of thousands of Tolkien's fans, spawned by RPG rather than pure litterature ...
think about the whole gaming industries on computer/consoles without all those RPGamers ... Japanese gaming industry would be 1/3 its size (no Final fantasy, Secret of Mana, Dragon Quests, ...) ... no gaming legends like the Ultimas, Warcrafts, D&D (Krynn and Cie), Might & Magic (and Heroes ofc) .... how could there have been a need for MMORPG without what Gigax helped create ? ...
Who remembers playing at Warhammer RPG, Star Wars RPG, Shadowrun (the Blade Runner before Matrix), Vampire (and the whole serie ...), and even AD&D ? ...
.... all of this we owe it largely to Gary Gigax and pals
... and so much more of our fun and sweet child/teen memories