It's not going to work out, there's going to be way to much hostility and stupid topics around "Why (Insert_Sport here) is better than (Insert_Sport_Here)" which will just cause massive flaming and spamming.

Could you please just split the two into there own topics?

Just go look at it right now, all the football fans are "Rugby is for pussies/queers etc.." And Rugby Fans "LOL HAND-EGG ISN'T A SPORT" etc..