...couple thoughts...
As mentioned above, 2 SB victories is a minimum if that pass was successful. Doug Baldwin recently did a podcast where he guaranteed that there would have been a third. If there were more than 2 SBs there would be several players on that team that would easily go to the HOF. Obviously, RCW wouldn't be left out.
Secondly, whether you believe the NFL "steers" games or not, it's easy to see how the League would influence its own HOF. Today, if RCW was announced as a HOF winner, Denver season ticket owners would riot in the streets. (Yes, I know there's a delay, but making a point) When RCW's time comes, if Denver fans dislike him anywhere near as much as they do today, the NFL won't crown him. They want it to be a celebration and have fans feel some sort of pride... not have his jersey burning in the parking lot. Conversely, if Bronco fans like him at that point, he'll probably have a pretty good shot at getting in.
Lastly, RCW has never made a goal of the HOF. I'm not infallibly informed, but I've never heard him mention it. Alternatively, he frequently talks/talked about being "the best to ever play the game". A)Why do we care about HOF if he doesn't? B)If "the best to ever play the game" moniker is still on the table, then the HOF argument will be moot at that point.