Yes but without the need for the full furniture. One should be able to miniaturize everything else but the action. I think such compact designs will eventually appear but the difference in real action versus very good hybrid digital actions is of highest interest to musicians who typically have access to real pianos. Roland, Yamaha, Kawai, and others have been moving in that direction over the years and the top models by Yamaha and Kawai have passable actions though they still have a large piece of furniture around them.