As with most business models, there is a limited window of opportunity for the model to take hold and prosper. The longer it takes for Better Place to get their vehicles and infrastructure in place, the less likely it is that the business model will succeed.
Better Place is based on the cell phone business model in which phones were sold cheap or given away free as long as you pay for the service. I can't say that the model translates perfectly, because the vehicle without a battery was still sold in the $10K - $20K range, but that is still cheaper than a $35 - 40K LEAF. The batteries are then leased, which is similar to the cellular service plan, so providers make money on the long term contracts, and not the upfront product deliveries.
The forces closing the window of opportunity:
1) Competing approaches [hybrids, plug-in hybrids, alternative fuel ICE (CNG, alcohols, diesel, hydrogen), fuel cell vehicles, etc.] are rapidly approaching viability, and have taken hold much more quickly.
2) Battery prices are dropping, decreasing the value proposition of the Better Place business model compared to the above alternatives
3) Charging infrastructure is smaller / cheaper / simpler than swapping stations, and proliferating far more rapidly.
4) Gasoline prices have stablized at $4.00 / gallon, and Americans are acclamating to them.
The forces propping open the window of opportunity:
1) Battery power / energy densities are increasing very slowly, which keeps their practical range implementation low and their recharge times high, maintaining the value for swapping.
2) Many automakers simply let Nissan and GM take the lead and sat on their product offerings that would compete with Better Place, buying Better Place more time to implement their business model.
I don't think that Better Place needed to concentrate only on fleet sales of vehicles and infrastructure. Selling to consumers directly doesn't prohibit sales to fleets, etc., so I think it increases their chances.
Overall, I think the existence of Better Place pushes automakers and battery suppliers to elevate their game to provide more viable options, which is what free market competition is all about - serving the consumer.