You definitely could, but that will increase costs even further. You're potentially replacing all your lighting, climate-control, water heating, cleaning (dishes/clothes), cooking & fridge/s to be more energy efficient also.
Actual power storage is a reasonably small cost (probably < 20%) in even the solar, power equipment (inverter, switches, controllers, etc), power-storage equation anyway if you want to go completely off-grid. So why does this product make anyone more likely to switch than the existing options?
I'm assuming you'd minimize your loads, it is silly to size your solar system for a business-as-usual set of loads.