The MZ series are nice indeed, but to me, anything with built in speakers just doesn't seem pro level. Still they could use them as a very basic skeleton of what I'm proposing. The sequencer inside the concept I suggested will be based off of traditional DAW functionality i.e. Reason 9, Studio One, Logic, etc. The user will be able to start and finish a whole production, vocals and all, with this device, no computer needed. But if the user wants to connect to a computer for vst's they can.
The Px 5s is cool, but it's really limited with just a stereo recorder and 8 track sequencing. That's what I mean about Casio, they seem to hinder their products. It could be limited features or an illogical user interface, Casio isn't making the gear that I expect them to. I know it's not only about me, but I'm assuming for many professional studios/producers because you rarely see any Casio products in these places.