No, I think people will grow tired of LION KING. And I don't have any faith in TARZAN at all.
Yes, Disney is into making money. In these times - that's ALL they are into. However, I don't think LION KING could have a solid 20 year run. It'll get to 12 years.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle