Ghastly, yes, the bandwidth of the connection can be saturated, but only if the router does not have the proper control for bandwidth sharing, which most (if not all) consumer grade routers do not have.
Aces High requires very little bandwidth and if a router could be configured properly for bandwidth sharing, a P2P download over a 512Kb/s connection would still allow the game to play just fine over the Internet.
I do not know of any consumer grade routers which have that as an option, and if they do, do they have a user interface which anyone could understand in order to program it up.