Nexus Blitz and Nexus Seige
As you can see, Nexus Blitz is a major hit with the players.
However, about 70% fear this will replace all other gamemodes except PvEs.
I have a small suggestion, anyone who played Overwatch knows what I mean.
Every season, ( Not game season, I mean every three months ) there will be a gamemode. A tame gamemode, not like ( watch the dislikes when I say this ) URF or ARURF; but one like Ascension, Nexus Seige, Poro King and Dominion.
Of the tame gamemodes will be the normal play ( so like usual ) and a limited-time Ranked Play.
This would allow more players to enjoy new ways to play, instead of giving them a taste of a gamemode they want to play more of. And other players can form metas around the gamemodes whenever they're available for Ranked.
As an example, let's say:
The current meta's best champions are:

In Nexus Seige it'll be:

In Poro King, It'll be:

In Ascension it'll be:

And so on and so fourth.
Riot, if you give people the chance to take a certain style of play seriously with an objective other than kill and push every game; more players will be attracted to said game.
Many people were bewildered with the escort missions in the Star Guardian PvE, and the power play idea in the deathmatch PROJECT gamemode.
So think about it, because me and a few friends would love to get down with
in a mode other than the endless 20 min grind.
[slayer-jinx-catface]
Oh yeah, besides that please just bring back Nexus Seige.