Things are changing fast my friends..

I hope yes, because we don't need to transport a elefant weight like some actual keyboard arranger's.

I agree...Things are going to change very rapidly in the near future technologically with musical gear, just wait and see.....
Arranger KB's are no exception.

I am sure of this. It is a given that the necessary processing power will be provided by something like an iPad. Of course you will still need a physical keyboard, but maybe a controller similar to the Casio PX series pianos will provide a good feeling but light weight keybed to control this inevitable processing power.