Not really, no. In a sense, never has been. "Survival of the fittest" was a poor formula (I remember reading that Darwin was not fond of it at first and used it somewhat reluctantly but I can't remember where), and a very bad summary of the theory of evolution. To start with because the important thing is differential reproduction (with modifications) between individuals, but not survival per se. But also because natural selection is just a part of the modern theory and many others aspects have been added since then (mutations, drift, phenotypic plasticity, environmental inheritance, etc).