The problem is, this theory has way to much FACT in it.

He only talked through a synthesizer.
He should have been dead years and years ago from his disease.
No one ever questions the guy in a wheel chair.
He was the perfect puppet.

All of his theories were in an area such as to keep people from finding the truth. In specific, his string theory to pave over the holes in the theory of relativity... are all disproven by the electric universe model. So, the idea that they kept the wheelchair around for so long to keep the truth hidden is plausible.