Momentarily ignoring the fact that there would be a large saver arranged between the teams if this ever happened, this would hurt American pro pool.
In the context of what pro pool players earn, the guaranteed $15,000 payday that comes with earning a spot on the Mosconi team is massive, roughly equal to what one earns if they win the Derby City 9-ball event or both of the Turning Stone events. That's why the chance to gain a spot on Team USA helps participation levels in all events carrying Mosconi ranking points. Get rid of the guaranteed payday for the losing team and a) far fewer would aspire to make the team, b) some might decline the invitation to play on the team, and c) the likelihood of fielding the best team possible will decline.