The astrophysicist Laurent Nottale develops since 1984 the scale relativity, which aims to unify quantum physics and relativity theory, using a fractal space-time.

I would like to understand why this theory, which seems have a good potential, is not taken seriously by the physics community, in the sense that it is not as developed as (of course) the string theory, but also the loop quantum gravity or the noncommutative geometry model of Alain Connes. Is it a political problem or a communication problem, or are they serious obstructions for such a theory to be valid?

Edit: Scale relativity is not at all in the category of "unpublished personal theories", see these references from the wikipedia page: the theory admits several papers published in peer-reviewed journals.