Well, the other side of it is that there are some companies out there who just love pushing out new arbitrary "updates"
all the time.
I'm actually curious as to which of their markets, their professional or their enthusiasts, are the bigger earners. I'd reckon it'd be the former though, as they had been, and still are for the most part, situated in a very local market, and you can probably garner from their webpage what their primary target is. Then you factor in the pricing, the actual design (the cable connectors, and the novel way to remove them with the protrusion all seems fairly aimed at professionals) and the high-profile, high-volume clients. It's what got them started off and it's hard to see that changing anytime.
On the flip side, their UIEMs are aimed at consumers, and they've been selling those at much greater volume than the customs it seems (I can't get a exact source but from various comments and if you take note of their actions that seems to be the case)...in that sense/market I guess they'd have to continously pump out newer, shinier stuff. The pressure's on them, but they don't, and they shouldn't, have to pigeonhold themselves into that sort of release model if it's detrimental to both the maker and the consumer. Let's just hope that they don't run out of steam.
And technically, there has been a "higher-model" release in the form of the fabled 668. Perhaps they'd finally see the public light of day and finally usurp those crusty, wretched old models. A competitor to that rumored new JH flagship might make sense.
But frankly the old stuff has been held in a positive light to some of the new offerings, so I'd take that over anything else.
Think about it - the newer they get, the shinier they get, and they'd just become a safety hazard. Car accidents in Tokyo would increase exponentially because these fangled audiophiles start wearing these ultra-diamond-coated FitEars MH889 Refraction Editions out in public all the time. It'd be a disaster. Millions of lives lost, billions in damages. The government would have to step in and outlaw earphones. The shunned japanese now-closet head-fiers will begin a mass exodus to other, more audio-welcoming countries. The economy will plummet because half the darned remaining population are those fangled audiophools who were wearing these things in the first place. Finally, Japan collapses.
All because people wanted newer models. Will you live with that in your conscience?