Well they can always go bankrupt I guess?
To get an idea how bad it is, see this poll:
http://wickermangames.co.uk/polls/view/5
It's a website of a company making sci-fi game but high fantasy still wins by a large margin.
If someone has never played a CRPG with another setting, this is the only way they can vote. If most of their favourites (likely) are High Fantasy, they will feel that they
should vote for it. I suspect that, even here, that applies. Planescape probably counts as High Fantasy for that poll. Fallout is split between Post-Apocalyptic and Retro-Futuristic. Given that High Fantasy is defined, there, as "Magic, Elves, Dwarves and such", Arcanum and Shadowrun at least partially count. If most CRPGs, including favourites, are High Fantasy, then High Fantasy is probably you favourite setting. Only Post-Apocalyptic challenges it in the RPGCodex top 10 (
http://www.rpgcodex.net/forums/index.php?threads/rpg-codexs-top-50-crpgs-results-and-reviews.89680/), and ony because of the existence of the Fallout series.
A problem with that poll is that there is only one "high fantasy" option, while the other genres/settings die a death of 1000 cuts: what if Hard Sci-Fi, Cyberpunk and Space Opera were combined into one category? They might win. They are certainly not mutually exclusive, if the Sci-Fi is a little less hard than diamond. Call it "Sci-Fi" and it would win. There is enough variety within High Fantasy to compete with Hard Sci-Fi, Cyberpunk and Space Opera (Planescape Torment, Baldur's Gate 2, Morrowind, The Witcher). Steampunk could be combined with Retro-Futuristic, as it is the same kind of thing.. Historical and Modern-day can be combined, too: if something is set in the 1980s, is that historical or modern (and does it matter how long after the 1980s the game was released?)? Even if Low Fantasy was combined with High Fantasy into a single "Fantasy" category, such a more condensed poll would probably give more interesting results.