Most probably the same reason that they haven't recreated the mighty CS80 or GX-1, cost and market. The organ and keyboard market is extremely small, even when compared to professional synthesisers. Hence in order for companies to manufacturer something like the Genos, they need to maximise the profit margin. I'm glad though they didn't build the Genos like a Montage as I can only just about manage to carry it in a heavy duty padded case to church! Any heavier I'd need a roady. The same goes for the keyboard action, higher quality keybeds add significant weight to keyboards. These days it's much cheaper to use computer chips and ROM, rather than discrete circuitry. Once the initial development costs have been factored in, the software and digital content can be reused across a wide range of products. I still have my Yamaha PS30, one if not the first of Yamaha's portable keyboards. It's packed with discrete analogue circuitry and there are more PCBs than in a Genos. Build quality is excellent, even if by modern day standards it sounds incredibly basic and cheesy. I recall back in the early 80s that keyboard cost around £400, which in today's money is about £1600. The only reason we have amazing sounds and features in today's keyboards is down to low cost manufacturing, microprocessors and technology that has developed across many other platforms (non-musical). I remember also back in the 80s my family had a B405 Yamaha Electone double manual organ. Seem to recall that cost around £1800 then (about 1983) and it weighed 50kg! Adjusted for inflation that would now be £5600, more than the price of a Genos!
I'm sure if arranger keyboards were as popular as smartphones we would see some very innovative developments, but I am happy that manufacturers like Yamaha and Korg are still building some amazing sounding instruments.
Simon