Regional War

Basically we have different factions so it would be nice to have a system which would allow faction wars. This in return, depending on which faction is winning would give gameplay changing buffs (only for normal games in order to comprimise the competitive side in ranked games) like...+2 g / min or +5 exp, or even something entirely different (these are just examples). There could be cycles so like 2 weeks on, 1 week off where the wining fanctions enjoys the buff, then reset. Has this been discussed before?