Rickenbacker guitars/basses are heritage classic instruments.
The designs haven't been updated (much) since the 50s/60s.
That ensures their classic sound/nature... and that's why folks buy them.
The flip-side: There have been advancements/improvements made over all those years.
The Rick sound is the sum of its construction/components.
If you bring the specs up to more modern standards, the sound would change.
Making changes to "heritage" style instruments is a turn-off to many folks.
ie: Gibson took a lot of flack trying to enhance/improve the Les Paul (another heritage instrument).
It's very much a catch-22... because folks like those classic instruments (warts-and-all) for what they are.
Change it too much... and suddenly you lose that classic appeal.
Unlike many instruments, Rickenbacker guitars/basses maintain their value.
I sold my JetGlow 4003 (about a year later) for exactly what I paid for it.
With that kind of demand, you can see why Rickenbacker isn't in a hurry to change it.
Sterling Ball (owner of MusicMan) is outspoken about not wanting to be pigeon-holed into solely producing "classic" instruments. They're trying to innovate with instruments like the Big Al. While a great instrument, the Big Al's angular body is something many folks don't find aesthetically appealing. The Neodymium pickups, four-band preamp, active/passive switching, and construction are all stellar. For better/worse, the classic Stingray is much more popular.