Importance of the US dollar? It is increasingly irrelevant, and will be more so once more rats start jumping off the ship. Particularly with BRICS membership growing and the increased rapprochement of Iran and Saudi Arabia. Iran and Russia have already integrated their banking systems.
You speak of targeting ICC officials (not the same as sanctioning the ICC as a body). This would be the final nail in the coffin for the US, confirming it’s status as a pariah state, along with their little six-pointed friend.