Also, Disney/MGM back then was meant to be a half-day experience. That's why Typhoon Lagoon opened in the same year, along with Pleasure Island. Eisner hoped to extend guests' stay a full day via these three options. Guests would head to Disney/MGM in either the morning or afternoon, with TL in the morning or afternoon, and PI at night.
The problem was that Disney/MGM was more successful than he had anticipated, and was packed to the gills. So they immediately set on expansion to make what was supposed to be more of an experience into a full-fledged theme park.