This is very much like Aragorn taking Theoden's idea to ride out and face the Orcs in one last stand at Helm's Deep.
I think Jackson is giving as much of the decision making to Aragorn as he can. I'm not sure why, and I don't agree with this.
Just another thought as I posted. This change in Gandalf is more believable movie-wise as Saruman has spread the seeds of doubt into his mind at the begining of the EE. This also gives some credence to Gandalf's question of whether Frodo was alive to Aragorn in Edoras.
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