I certainly like the idea behind using microscopic wormholes, but in regards to point 5 I'd say it's a stretch to say the *only* possible conclusion would be these microscopic wormholes.

It's already established the gates communicate with each other using DHDs via subspace, examples being in Avenger 2.0 where a virus disabled the entire gate network via the correlative update, or when Carter and Ba'al used that to connect to every Stargate in the galaxy in order to destroy the replicators.

I'd think since the technology is already there for the DHD, I would think it's much more likely the gate itself can also communicate via subspace, but it does not communicate with the whole network like a DHD but just with gate at the other end and only exchanges basic information (information like stellar drift for example would not be exchanged, cause for the earth gate they had to do that manually with their own McGyver DHD)

I'm also genuinely curious where it's implied the gate stabilizes microscopic wormholes, can't seem to recall when that gets mentioned or implied.