The modern era has had several attempts at adopting a so-called nomad science as a meta-theory of everything. Here is a list. Most of them were completely terrible.
From 1900 to 1939: Race Science
From 1910 to 1960: Psychoanalysis
From 1930 to 1980: Marxism
From 1950 to 1980: Cybernetics
From 1975 to today: Postmodernism
From 1979 to 2008: Public Choice Theory
From 2008 to today: Harry Potter