The idea of increasing the current ~1.6 KWH effective battery capacity we now have is certainly intriguing, but the cost is rather extreme. Another factor to consider is the duty cycle on the MG's. I'm assuming the current design and cooling is intended for intermittent use. Also, while the MG2 is capable of high KW input for power at higher speeds, I expect such input is very intermittent now, since it is beyond the current battery pack. One thing that more battery capacity may provide is more storage for regenerated energy, much of which is wasted now.

Finally, as an electric car, the Camry is not very efficient. That is, it may get 1-2 miles per KWH, whereas if it was designed for a higher component of electric drive, it could be, say, 3 miles per KWH. Pure electrics may go up to 5. Of course, the intent of the Camry MG system is to relieve the ICE of peak power requirements and isn't expected to be the most efficient pure electric drive.

Jeff