assault gamemode?

maybe league of legends should have a more variety of game modes to keep people entertained like maybe an assault mode where red team has to attack a nexus in order to proceed to the next nexus and blue team has to defend. once red team has destroyed the first nexus the map will switch to the next nexus and then red team will be able to spawn where blue teams nexus was destroyed. red team wins when they destroy all 3 nexuses and blue team wins when the timer runs out.