Nunu support: a meta Riot will most defnitly kill with balancing.
Disclaimer: I DO NOT seek to discuss whether the player should be banned or not. I DO think he should bring his own duo to play off-meta that would obviously ruin the fun of the a particular role. However, I DO think the ban is a mistake according to CURRENT Riot's guideline, it is not a bannable offensive to choose off-meta strategy that has reasonable winrate. If Riot thinks off-meta players need to bring their own teammates in affected roles, it has to be a pre-established rule to be punishable
The current Nunu support dilemma should reminds those of us who were around in the lane swap meta, double jungle meta, and first season jungle meta. They have one thing in a common: sacrificing a specific role to create opportunity for the team.
These cases played out differently. Some became meta, some are killed by Riot.
The difference here, is that junglers eventually balance itself out when the enemy team adopted the same strategy, but lane swap and double jungling creates a permanent underdog in both of the teams.
Advertised as a team game, the league should have allowed the any strategy to win, and it's played as such in the competitive scene. The solo queue however, is different. It's comprised of individual players who are strangers to each other, and may or may not willing to sacrifice their fun to earn a win.
We can safely assume not everyone is willing to do so, which is already the case for supports. The support role is a result of 4 income sources in a game of 5 players, and Riot has be struggling for years to balance and promote support role. Junglers balance itself out because it expanded the income source from 3 to 4, it doesn't not involve a fundamental conflict and eventually becomes the meta because of better utilization of resources.
Nunu support does not solve this fundamental conflict. Its gold income comes from enemy jungle or snowballing, neither of them is a stable income. It can potentially damage the bot lane income of the team, and involves a great risk (that is on another teammate who is not the Nunu player).
In order for bot lane to balance out like the jungle, the enemy has to adopt a similar strategy, let bot lane become an 1v1. However, Nunu support meta is by nature chaotic and hard to balance Its income is difficult to be calculated and controlled by the designers. Without the support of balancing, solo bot meta is unlikely to be mainstream meta, resulting a bot lane 1v2, and thus the player not having fun.
The questions then,
Are you willing to be the one sacrificed in a solo queue game? Or more importantly, have you actually agreed to a stranger to play off-meta that will impact your role?
If the majority is no, it will be no surprise that Riot will likely kill this meta with balance changes, no matter what the outcome of the ban is. Just like what they did with the lane swap.