Disneywar, pg 96.: "Operating income at Disney jumped from less than $300 million when Eisner and Wells took the helm to nearly $800 million in 1987. An internal analysis commissioned by (CFO) Gary Wilson to help understand the company's burgeoning profit found that nearly all of it came from just three sources: raising admission prices at the theme parks; greatly expanding the number of company-owned hotels; and distributing the animated classics on home video."
Also, the home video sales was the idea of a Katzenberg lieutenant named Bill Mechanic. Everyone opposed it - Eisner, Katzenberg, Wilson, Roy Edward, Frank Wells. But after the first two movie videos (Pinocchio and Sleeping Beauty) made a fortune, all opposition to home video collapsed. This was happening alongside the wider discussion about the future of Disney animation. Roy Edward fought mightily to keep it, saying it was "the soul of the company." Eisner & Co. said it was too expensive any more. But the home video success helped convince Eisner there was money to be made in animation.
So you were correct, Eisner wasn't the driving force of the home video strategy, but he at least had the good sense to seize the opportunity once it became evident.