Are science explanations of the universe tending more and more toward metaphysics and philosophy?
Modern cosmologists use language that is less and less "concrete" or "quantitative" than it was in the time of Einstein or Schrodinger or Heisenberg.
Talks about multiverses remind one of the older metaphysics and philosophy. Could it be possible that ultimately the universe is explained through the essential ideas of metaphysics? Will we find that after all there was a limit to objective and experimental study?
I feel the blurring of objectivity started with the Uncertainty Principle, where the very act of observation changes the property of the particle.
Add to this, the penchant quantum physicists have for Eastern-style mysticism. To wit, Erwin Schrodinger who was interested in the Upanishads of India.
Also google "quantum mysticism"
Edit: See also Baruch de Spinoza, Western rational philosophy.