I'd say the money raked in by the LOTR and Hobbit films had more to do with it.
Let's face it -- most writers lead pretty dull personal lives -- unless the prospect of watching someone sitting at a desk sounds exciting. The "life" happens mostly in the mind.
Tolkien's life, post-Somme, was as a professor, not what most would consider boiling with glamorous adventure -- except possibly to other professors. I'd point out, however, that his Oxford lectures were always packed, which says something. Though he developed a tendency to mumble, in his later years -- and recorded interviews are almost all from his later years.
Anyway, as for other fantasy writers, Talbot Mundy would be a good choice -- if anyone remembered him. They wouldn't even have to fictionalize it, as he did that himself. IIRC one of the things he claimed to have done is take a walk up the west coast of Australia solo.
But his actual life crammed enough stuff in to make seveal movies.