Mick,

By the time Dylan went electric in 1965, Cisco Houston had been dead for four years and Woody Guthrie was into the final stages of his battle with Huntington's Disease (he died in 1967). I don't think it would have bothered Odetta because she did albums with electric backing in the '60s herself (she did a great version of "Strawberry Fields Forever"). As for Will Geer, he was an actor whose connection to folk music was primarily through friends like Woody and Cisco.

Groucho