Are plug-in hybrids the key to fuel cells?

Forget fuel cell cars?

GM is once again on the fuel cell crazy train.

"After years of intensive research and development, General Motors Corp. says it now is ready to concentrate on finding a way to produce hydrogen fuel cell powered vehicles for the mass market." (more)

Haven't they been doing this for decades?

While GM has achieved impressive results with fuel cell vehicles, the costs of this technology are still astronomical, and then there is still that little problem - the hydrogen highway. Where is it?

Thus, might not plug-in hybrid vehicles be the key to fuel cells? Couldn't a small fuel cell increase the performance of such hybrids, while making fuel cells significantly smaller and significantly cheaper?

Today, aren't full fuel cell vehicles a great R&D exercise, but PR nonsense?