It’s not clear that the Trumps are accustomed to so many servants roaming around their home. We know that Trump is a Germaphobe by his own admission. Personally I would only want a couple of house keepers and 2 cooks. Then have a team on call for big events.
You have the staff you need. A new usher will be hired, so it is not the size of the staff. Do you really really really really really think Trump spends his time thinking about how many workers are in the White House to clean and scrub? If he does, we have the wrong person in the White House.