[allmost]

Concept of zero (vacuum/Higgs field/whatever) energy loss makes it plausible. Unicorns are plausible as well though... :)

[AndyTheBear]

I view unicorns as merely "possible" rather than "plausible". In that I think them very, very, unlikely...but can't quite totally determine they are impossible.

But I suppose if I viewed an infinite multi-verse as plausible, I could certainly deduce it was plausible that some universes might have unicorns.