Is Mr House a dictator?

[Oppen]

The BoS do not and will not ever have the military capability to challenge him

Eh, wrong thinking.
They haven't chance with NCR, but still, they attacked them.

Also, alliance with BoS for House is completely negligible, while he have his robot army. Notice that, they in future can create some problems.

As an extra, if there is anyone in the Wasteland that might eventually understand how House's tech works, they are either the BoS or the Enclave remnants. Most of his advantage is his understanding of tech, so the risks outweights the benefits vastly for him. Specially when they're tech protector fanatics. They'll want to have it, and they'll want to stop House from using it, at any cost.

 

[Walpknut]

I don't think the remnants will know anything about House's Tech, they are a doctor, a pilot and 3 soldiers, not exactly Scientific Experts right there.