If Casio wants to seriously get in to the arranger market, they would have to introduce something ground breaking and different to the market.
For them to accomplish this, product development and marketing would need to work hand in hand. One can not work with out the other.

Casio should start off with a teaser product.
They should start off with a cool/sexy looking product.
IMO this product should be something like an Akai MPC 2000.
It should be this cool” box” that you can connect to your motif xs, M3, PSR s910 Audya …..
It should sample, have styles and the ability to play styles and a sequencer.
I am leaving out all of the details.
But, once the cool/sexy game changing product is developed, it is up to the marketing department to take it and run with it.
The goal would be to get Casio in to normal keyboard circles. It should not be marketed as an arranger (although it will be). And, the reason it will be a “box” if people are still afraid to have a “casio” product as part of their rig, but can not resist the ground breaking sounds, styles and feature integration, they could “hide” it under a table or some place.

Another important part of the puzzle is that it would need to be reasonably priced. It should not be a high-end product.
The initial product should be cheap and they should make money on the additional content people could buy (sounds, styles and plugins). It should be a product that gets people thinking “Casio” in a serious way and look to Casio for bigger and better things. You would not be asking people to jump ship. With this new product, you are not asking people to get rid of their current keyboard and get the Casio. You are enticing them to add Casio to their rig and forcing people to look to Casio for serious musical products.
After the “box”, they could always add and develop to the line as needed.