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It's easy to say or write rather than getting done in practice regarding the hy-brid car batteries providing power to the grid at peak load hours.
First there are not that many hy-brid cars in use now and there are not parking lots and garages built to connect batteries to grid. Even if with lots of cost of rewiring of parking structures, batteries discharged to provide peak demand of grid would take hours to recharge after peak hours unless there exists a technology to recharge at faster rate like within half an hour or so.
Otherwise the hy-brid car owner would be at great disadvantage to drive off his car when and as needed either in emergency or to go home in the evening or go to work in the morning hours if his or her car battery is drained off by the utlity. It would be much annoying and frustrasting if you have to wait for all electric car batteries to recharge or use gasoline at a higher expense for hybrid autos.