The thing is home organs were monstrously expensive back in the day and you needed a room dedicated for that one instrument it was so huge and heavy. Home organs are still available today and have not changed in terms of their looks and functions significantly since back in the day. Whereas arranger keyboards most certainly have. And are much more affordable and takes much less room .

It is true that there is a market for a purely software based instrument with as I've said before, potentially just an iPad some apps and a controller keyboard. How ever the appeal of an arranger keyboard has always been its flexibility Immediacy and the fact that it has designated hardware functions that makes it instantly playable straight out of the box. No latency , software conflicts etc.

The home organ evolved Into the workstation arranger and the workstation arranger is evolving into a highly integrated music production system able to play styles via midi , audio files and record external instruments and able to slot into an external daw where required .

The technology of arranger keyboards are already incorporated into most of today's hi end workstations but a dumbed down version . Time will tell where it goes from there but we are a long way off from the death of arrangers . That's for sure .