I don't have any experience about CF case makers, but the price-point is such that outside custom manufacturing I can't see 'em ever becoming very popular. AFAIK
the average cello that gets a hard-case
is priced around $5000, and an average BG that gets a hard case, 2-3 hundred.
While a CF case would be nice, the average BG or guitar player wouldn't dream of dropping that kind of dough on a "plastic" case. Not on one that costs more than their bass anyway
There's all sorts of small scale CF manufacturing going on, and if You don't need anything very special, most of those shops will roll one for You.