That would have been a horrible decision. Johnathon Harrison (Dr Smith) made that show.
The "Lost In Space" pilot didn't even have the character. Then, when he was added, he was supposed to be killed off after six episodes.
Guy Williams, June Lockhart and Mark Goddard (although they liked him personally) were not happy with the permanent addition of Jonathan Harris to the show.
Re: “That would have been a horrible decision. Johnathon Harrison (Dr Smith) made that show.”
Correction: Make that “Jonathan Harris”
http://en.wikipedia.org/wiki/Lost_in_Space