I think Gorgoroth means a game that is balanced enough to hold together for 15 years--as opposed to 3e and 4e, which (to some people) showed their flaws more and more over time until people got sick of them.
Well, it isn't like any past edition did this 15-year trick. Nor do I think the entertainment sector or current economics support the idea that they can just publish the same game for 15 years and expect it to be viable. I mean, more power to you, but it doesn't seem a realistic hope.