There is another way Nissan and other manufacturers should try. Since the tax rebate amount is based on battery capacity in current legislature, they should push the same for replacement car battery. This would help stopping the drop out of current users and giving potential users more confidence.
Nissan needs to understand, in fact, they are selling two things, car and battery - not just one car. The car itself actually costs Nissan almost nothing, they could get back their investment in no time(not true for Tesla, they have to sell the whole car and each car they sell counts--to Nissan that's each battery they sell counts). But as long as the battery adoption slows any bit, they would get nothing back, painfully.
I would say, if Nissan knew Tesla better, they would not drop their initial battery change plan. And at current selling speed, the battery cost would not come down soon. The battery lease plan actually tells us they probably have lost quite bit of their confidence, and they are preparing to be 'oil' company who sells discounted gasoline.
it's a tough bet.