In an alternate universe, this is the best selling fantasy role-playing game of all time. Oh sure, there are newer and hotter games, but Wanderer has cachet that no one can beat. It has so completely dominated the industry that many people can't even imagine a role-playing game where you can't die during character creation. Even people who know nothing about gaming recognize references to Wanderer.
Of course, when Sorcerers of the Mountain took over the license, many people felt the new edition had diverged from the previous edition too much. I mean grid maps instead of range bands? The new cross-training system that made occupations less relevant.
And latest edition, Wanderer 4E is barely recognizable as Wanderer to people who still remember playing good old Tan Box Wanderer...