Which rental company will buy them out? Let's look at that.
Enterprise - the largest rental company with 1M+ cars. They bought Philly Car Share and Mint Car share. Have maybe 1000 car share cars. They will bring a rental right to your home from their local office. why do they need car share when they offer that?
Hertz - Now #2 once they buy DTG who is #4 and will have about 500K cars. They bought Eileo car share technology a few years back. Eileo has patents and has the same technology as ZIP. Have about 850 car share cars nationwide. Why would they buy ZIP when they have the technology?
Avis - #3 with about 400k cars worldwide. Have a 9% stake in IDSY which is the technology that powers their car share technology. Has 30,000 car share cars deployed in the North East and Canada. Has cars at Microsoft, United Technologies, and RIMM corporate campuses amongst others. The furthest along technology wise of any of the rental companies. They also bought a company a few years back called Okigo which has the same technology as ZIP but abandoned it when it proved too costly to implement. Is probably going to roll out their entire fleet with the IDSY technology and has capex in their budget for next year to do so.
Reading the above tells me ZIP is on their own and buyout prospects are nill.