I think it would be brilliant if someone like Casio made another unit like the VL-1. Except I think today it would be a really ground breaking device. I would have the same sort of form as the old VL series, but it would also have a USB MIDI in/out, an audio line in/out and a mic in too.
The basis of the unit would be a keyboard similar to the VL-1
But it would be more like the size of the VL-10 below. Instead of a speaker on the front there would be two discreet speakers, one at each end, and the screen would be much bigger, colour and touch enabled like a PDA screen.
On board would be a sequencer and sampler and some basic synth functionality, but the device would be able to connect to a laptop of desktop to transfer files and export. It would have a slot for an SD card and sport wireless collaboration using bluetooth, but it would only work with other devices using the same standard.
But most important of all, it would have a CALCULATOR! built in.