What I have been doing to get around this problem is manually setting the *jetway.BGL to "OFF"; but this means I have to now add moving jetways to all the gates at the airport.
If the jetways can be removed this way and only the jetways are being excluded, it means they were modeled separately from the terminal, but their reference point wasn't in the center of the jetway object itself, which should be the normal practice.
In this case, then yes, you must replace all of them, because setting a too large exclude radius will end up excluding things you don't want to.
Of course, I assume you use the product in the correct way: so exit from the sim after you set the exclusions, and use the GSX Control Panel to compile the XML into an Exclude .BGL.