You have hit the nail on the head! Fender is odd. You'd think since they call it a "jazz" bass the First Thing they'd sell would be a 6 string one. Instead they seem to have some innate fear of more than 4 strings. And when they do stick a toe in the water (Steve Bailey) they scamper off into the underbrush at the first loud noise. And everybody else seems to be following Fender's lead.
It really does befuddle me. I mean, Dingwall can make a five-string, fanned fret Jazz bass with a Glokenklang pre-amp and it sells like hotcakes. People obviously have no problem with futuristic J's. And now Fender's come out with their Dimension series and pawn-shop series, which are both getting RAVE reviews... You'd think they'd realize that they have enough loyalists (or people who just enjoy neat things) that making non-traditional products just might work out in their favor.
I don't really blame Fender for not offering a 6 string bass. The market for anything more than 5 is pretty small when you consider that most of their sales are from beginners or hobbyists. And my personal observation is that most people who would be interested in a 6+ string bass tend to gravitate towards more modern designs.
I totally agree that people who play extended range instruments do tend to prefer modern-style instruments. That being said, there was a time when Fender was known as a pioneer. Remember, they designed the Bass VI... a lot of decades ago, and nowadays the Ibanez Workshop "created" the same concept and are calling it revolutionary.
My point is, Fender hasn't even tried, and I don't think it would hurt. Ibanez and Dean do quite well selling entry-level 6's, and it's not due to their modern design; it's because there is a real market for entry and mid-level ERB's. And, although they may be rare, Conklin managed to successfully market MULTIPLE Asian seven-string basses, which still boggles my mind.
I've sold many, many Korean/Indonesian/Chinese Ibanez/Dean/LTD/etc. models, and the buyers frankly didn't give two F's about the design. They wanted a high-C, but didn't want to sink (what was it, $3K? $2k? either way, an order of magnitude too high) into a Steve Bailey. Instead Fender continuously tries to rehash the same old designs, packaged in a new box (anyone remember what a disaster the roadworn series was?) and crank out models that, frankly, nobody really asked for. I mean, the fact that we're even discussing this on a 52 page thread - which includes people who have sunk literally hundreds of dollars upgrading a Chinese off-brand - should prove there's demand. Even if they just introduced it into their VM series (Squier's active five-string could more than easily accommodate another string [seriously, you could land a goddamn 747 on its fretboard]) it'd be a step in the right direction. If they made a Mexi/Cali version? It'd be in bed with me right now, instead of this ridiculous Harmonia.
Anyways, I suppose my point is that I need to write a very strongly worded letter.