There is no evidence that Strings exist or parallel universes exist and yet these ideas are seriously discussed and investigated. Not so the idea of the mind field.
It's seriously weird that you capitalise "Strings" and refer to "parallel universes" as if it was just one idea. But I digress, yes
string theory is taken seriously and so are
some ideas that include what you might loosely describe as 'parallel universes'.
Blue has asked an excellent question ("Why do you suppose that is?"), I strongly suggest that you consider it before reaching for another of your rather lazy stock responses, you might actually learn something...