Survival of the fittest is not of itself a bad thing. In can be a very good thing if the "fittest" means who posts the highest quality content.
Trying to fight the evolution and economic incentives of the steem platform may be a futile effort. Instead, it may more sense to understand how to shape the economic incentives so that quality is more highly rewarded than quantity.
RE: Darwin's evolution is not good for Steemit and Steemians