That is a very good question. I can't speak
about the opinions of other physicists as to the
validity of this particular theory, but what I can
tell you is that there are many, many theories
that try to unify gravity and electromagnetism.
And there are many, many theories that predict
more than the 4 dimensions we know of.
Unfortunately, none of these theories yet have
experimental evidence to back them up. But that
doesn't mean people aren't looking for them. There
are many experiments running right now aimed at
figuring this thing out. Here is an interesting
video that might help you learn more:
here to see
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