Most certainly won't but if only Agatio would get at least the NW map smaller. Might help things a bit.
How? The reason isn't the size of the map, it's that people are under the assumption that every Nation Wars, Frost is going to win, and Flame will get second place or even potentially first (In rare cases). This makes people simply want to not bother with Nation Wars, and can you blame them? Spending a couple of hours to get about a third of the winnings you could get if you just switched to another character.
Sadly, you just can't change a persons mindset like that. And in this case, you'd have to change quite a few mindsets to stay in the land they're given. And actually play.